There are hard copies. This site is a direct rip-off of Martin Fowler's Refactoring book, among others.

There's always the classics:

https://www.amazon.com/Design-Patterns-Elements-Reusable-Obj...

https://www.amazon.com/Refactoring-Improving-Design-Existing...

EDIT: And it appears the website is a direct rip-off of these books.