How do you cite textbooks?

All citing is, is using actual text from the book.

for example...

----I thought it was very interesting that the author used a metaphor in this context, "the ocean was screaming and life was bleak..." is really showed the contrast of the beach and the ocean---

the cited part would be the sentence with quotations from the book.

also to cite you can just make references to the book such as

--- when jimmy told Amanda that he loved to sit by the ocean and just listen to everything it really explained how much he appreciated things like.. ---

that is also a form of citing