Sounds like the author should be a taxonomy to me. You can have multiple authors to one book and multiple books to one or multiple authors, just like you can do with tags.
Related Posts:
- Issue On Listing Woocommerce Parent Tag List
- Get terms by taxonomy AND post_type
- Get term slug of current post
- query multiple taxonomies
- wp_set_object_terms() is not replacing term, but creating a new one
- Get terms that contain posts that in turn belong to other terms?
- wp_insert_term doesn’t work with custom post type’s taxonomy
- Custom Taxonomies Terms as Post Title for Custom Post Types upon Publishing
- Retrieve single term slug
- How can I add programmatically custom taxonomy terms to a custom type post when saving posts?
- post count is wrong when using same taxonomy for 2 different CPT
- Glossary with Custom Post Type
- Custom Post Type Archive Template
- Retrieve a specific field from taxonomy term through advanced custom fields [closed]
- Separate Custom Post Type Taxonomy by Comma
- Sort the main query in subcategories/terms?
- Get child terms of current term of the current post
- Get list of terms of current taxonomy archive for another taxonomy
- Dynamically create/remove terms in taxonomy when custom post type is published/trashed
- get_terms won’t display product_cat or any other custom taxonomies when specified
- How to get the first term for the current taxonomy?
- Output the content of a term organised by each of the CPT?
- How to filter the taxonomy terms based on another taxonomy term
- How to check the terms in single custom post type template
- get_the_terms return only last term
- Does WordPress limit the length of slug names for Post Meta or Terms?
- how to get URL of media uploaded to WordPress via media_handle_sideload()
- Show listings from Impress Listing plugin in random order using taxonomy and terms
- How to display product subcategories into my custom post type single page
- How do I display tags for a custom post type single page?
- Get post from custom post type order by two taxonomies
- using $wpdb to get custom post type with term
- Show posts from two or more custom taxonomy terms
- Allow user to set custom order to a list of custom taxonomies?
- Which post does a taxonomy term belongs to?
- Display post as term id
- Issue on Creating Custom Tax Term Dynamically From Another CPT Meta-box On Publish
- WordPress loop: Show only a Custom Post Type Taxononmy TERM
- Display Custom Taxonomy Alphabetically
- How do I require the specification of term in a custom post type and custom taxonomy?
- Get terms that contain posts that in turn belong to other terms?
- How to get custom posts sub category link
- Displaying custom-taxonomy-terms sorted by parent/child-hierarchy?
- Query posts with double taxonomy
- Adding predefined terms to a taxonomy
- Custom query – get_the_terms not work
- How to Display Posts From Category Within a Custom Taxonomy?
- Shared terms between taxonomies
- How to get dropdown instance value in WordPress custom Widget
- Get taxonomy term by slug in post on archive page
- custom hierarchical taxonomy and custom post type list contains surplus posts
- get_terms() returns Trying to get property of non-object error for custom taxonomy
- how to count the current posts terms
- Urls in Custom Post Type work for Terms but not for its Taxonomies
- Custom Taxonomy Terms in Menu lead to which page?
- How can I get 3 different taxonomy type terms in a div class element?
- Get Terms from Custom Taxonomy and Current Post
- Get terms for a specfic post from multiple taxonomies in custom post type
- Add custom post type taxonomy tag to article class
- Custom Taxonomy dont save in a frontend form for post a custom post
- Add filter to Admin list for all custom post types by their custom taxonomies
- Add the custom post term to the custom post title
- Retrieve Custom Taxonomies with Description and Slug
- How to list posts by term (custom taxonomy)
- Custom taxonomy not saving correctly
- Taxonomy terms with the same name are updated between separate custom post types
- Add a class to a div if custom post type has specific terms?
- display post count in archive page that have relation with another taxonomy term
- Return multiples taxonomies with wp_get_object_terms
- Custom taxonomy terms hierarchical navigation
- Excluded Custom Taxonomy Term Posts Displaying in loop
- How to order taxonomy terms by most recent post?
- Get all posts for custom taxonomy term
- posts_per_page is not working by term
- WooCommerce – Custom related product (Spareparts)
- Add active class to foundation 6 tabs while looping categories
- Saving Child Terms on front end not setting parent
- order taxonomy alphabetical
- Filter Term By Parent Term – Custom Post Type
- Filter By Term Not Working – Custom Post Type
- Display all Custom taxonomy terms and their relevant custom posts
- WordPress get all post with like in terms [duplicate]
- Get posts of an specific term of a custom taxonomy
- Custom Taxonomy is disabled on Edit page
- Best way to group posts based on custom post type terms
- Get list of CPT posts in *current* post’s taxonomy term
- Fetch posts list from fist CPT taxonomy term and list under 2. CPT
- How to List CPTs Under One Tax Term
- How to retrieve the permalink for a specific (custom) term?
- Exclude Custom Post Type from shared Custom Taxonomy
- Remove Custom Taxonomy Slug only without removing Custom post type slug in permalinks
- Get a list of categories ids
- List a custom taxonomy’s terms, with links, on the taxonomy page
- taxonomy terms array not working
- Taxonomy Query of Custom Post Displays Archive Instead of Posts
- get_the_term_list() wanting to loop through the returned values
- List custom taxonomy terms
- show 10 most recent custom post types excluding the one(s) from specific custom taxonomy
- How to Get The Taxonomy Term in Custom Post Type Loop Inside a Wp Query
- Taxonomy Archive URL + Template