How do I reference and cite a book chapter/entry in a textbook or anthology?
Answer
Create a reference
Template
For physical books: 
Author(s) last name, Initial. (Book date of publication). Title of chapter. In A. Editor & B. Editor (Eds.), Title of book (first page-last page of chapter). Publishing Company. 
For ebooks:
Author(s) last name, Initial. (Ebook date of publication).Title of chapter. In A. Editor & B. Editor (Eds.), Title of E-book (first page-last page of chapter). Publishing Company. https://doi.org/xxxx/xxxx
Example
Heinlein, R. (2017). On the writing of speculative fiction. In R. Latham (Ed.), Science fiction criticism: An anthology of essential writings (pp. 17-21). Bloomsbury.
Create a citation
Template
(Author last name, Book date of publication)
(Author last name, Book date of publication, p.#)
Example
(Heinlein, 2017)
(Heinlein, 2017, p. 14)
See the APA 7 website for more information.