Weis, Robert
Sage, 2008
Buku Teks
Rosenfeld, George W.
Routledge, Taylor & Francis Group, 2009
Buku Teks
authored by Robert D. Friedberg ... [et al.] ; illustrations by Jolene H. Garcia
Routledge, 2011
Buku Teks
Schaefer, Charles E.
The Guilford Press, 2016
Buku Teks
Bergin, Christi Crosby
Wadsworth and Cengage Learning, 2012
Buku Referensi