edited by Kathleen J. Bieschke, Ruperto M. Perez, Kurt A. DeBord
American Psychological Association, 2007
Buku Referensi
Soundararajan, Ramesh
Tata McGraw-Hill, 2012
Buku Teks
Corey, Gerald
Brooks/Cole, Cengage Learning, 2012
Buku Teks
Corey, Gerald
Cengage Learning, 2017
Buku Teks
Brannon, Linda
Pearson , 2008
Buku Teks