APA 7th Edition

Book citation is covered in APA Manual, 7th Edition, Section 10.2, beginning at page 321.

Parenthetical in-text citation:

(Kouzes & Posner, 2017)

Narrative in-text citation: 

Kouzes and Posner (2017)...

Note that the ampersand is used in the parenthetical form, but not the narrative form.

See APA Blog, https://apastyle.apa.org/style-grammar-guidelines/references/examples/book-references