Deep linking can be implemented in various ways. Using the most banal and formally correct is reporting within its pages, which indicate clearly that this is a link to a page of an external site.
What Is Deep Linking | Part 1
Deep linking is the operation to insert a page of a website a link (hyperlink) to an internal page of a different site. The term literally means “deep link”, indicating precisely which descends deep into the remote site and can therefore also be translated as direct connection