For libraries that have switched on the catalog details page, they have the option to configure a Request link.

This button displays on all records from the catalog, even if they are not requestable - for example if they are online only, the button still appears.

For example, this book is only available electronically (but the request link (Place hold button) is displaying then you get an error on the LMS side when you try to request it):

The dragon and the elephant : China, India, and the new world order

http://griffith.preview.summon.serialssolutions.com/#!/search/document?ho=t&l=en-AU&q=%22The%20dragon%20and%20the%20elephant%20:%20China,%20India,%20and%20the%20new%20world%20order%22&id=FETCHMERGED-griffith_catalog_b187154973

This setting should be configurable to only display on print material.