APA In-Text Citations for books includes:

1. (
2. the author's last name
3. comma,
4. copyright date
5. )
6. .     

One author: (Madrick, 2014).

Two authors: (Paitz & Waldfogel, 2012).

Three to five authors:
First citation: (Dertouzos, Lester, Solow & The MIT Commission on Industrial Productivity, 1989).
Subsequent citations: (Dertouzos et al., 1989).

Six or more authors: (Norris-Shortle et al., 2006).