Meta Box doesn’t appear

Without adding your custom post type, it looks like you’ve got the function called wrong on the second one

add_action('admin_menu', 'mytheme_add_box'); 
// Add meta box
function referans_add_box() {

Do you want to say

add_action('admin_menu', 'referans_add_box'); 
// Add meta box
function referans_add_box() {

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