How to display Multi Checkbos select Custom Field on the post?

Inside the loop:

echo implode (', ', get_post_meta($post->ID, 'typeofpub', true) ? : array() );

This will print all ‘typeofpub’ comma separed.

If you want to do something more advanced wheen you print, e.g. wrap it in some html, a good way is create your own function in functions.php, something lie:

function typeofpub( $post_id = 0 ) {
  if ( empty( $post_id ) ) {
    global $post;
    $post_id = isset( $post->ID ) ? $post->ID : 0;
  }
  if ( empty( $post_id )  ) return;
  $types = (array) get_post_meta($post->ID, 'typeofpub', true);
  if ( ! empty($types) ) {
    echo '<ul class="types_container">';
    foreach( $types as $type) {
      echo '<li class="type-' . sanitize_title_with_dashes($type) . '">';
      echo ucwords($type);
      echo '</li>';
    }
    echo '</ul>';
  }
}

Then in the loop simply use it in like so: typeofpub();

You can change the html output as you want, in my example an unordered list is printed, where the ul tag has the class types_container and every li item has the class type-{$type} e.g. for the type ‘Sport’ is outputted something like:

<li class="type-sport">Sport</li>

The function can be used also outside the loop, passing a post id as param, e.g.

typeofpub( 10 );