One work by one author

Walker (2007)    

Walker (2007)  

(Walker, 2007)      

(Walker, 2007)

One work by two authors

Walker and Allen (2004)

Walker and Allen (2004)

(Walker & Allen, 2004)

(Walker & Allen, 2004)

One work by three authors

Bradley, Ramirez, and Soo (1999)

Bradley et al. (1999)

(Bradley, Ramirez, & Soo, 1999)

(Bradley et al., 1999)

One work by four authors

Bradley, Ramirez, Soo, and Walsh (2006)

Bradley et al. (2006)

(Bradley, Ramirez, Soo, & Walsh, 2006)

(Bradley et al., 2006)

One work by five authors

Walker, Allen, Bradley, Ramirez, and Soo (2008)

Walker et al. (2008)

(Walker, Allen, Bradley, Ramirez, & Soo, 2008)

(Walker et al., 2008)

One work by six or more authors

Wasserstein et al. (2005)

Wasserstein et al. (2005)

(Wasserstein et al.,2005)

(Wasserstein et al., 2005)

Groups (readily identified through abbreviation) as authors

National Institute of Mental Health (NIMH, 2003)

NIMH (2003)

(National Institute of Mental Health [NIMH], 2003)

(NIMH, 2003)

Groups (no abbreviation) as authors

University of Pittsburgh (2005)

University of Pittsburgh (2005)

(University  of Pittsburgh, 2005)

(University of Pittsburgh, 2005)