Define relations with different post types in WordPress and access the related posts in the template files.
Custom Post Type (CPT) Relations plugin can be used to create relations within different post types in your WordPress.
CPT Relations will list all the registered post types in the wordpress and you can create any number of relations for any post type. Once a relation is created, you will see a metabox with autocomplete field in the Add New page of the selected post type. The field will populate the via AJAX while you type the post name you want to related.