Shulman, Lawrence
Brooks/Cole Cengage Learning, 2011
Buku Teks
American Psychological Association, 2018
Majalah, Jurnal, Buletin
Corey, Gerald, author
Brooks/Cole , 2001
Buku Teks
Dadang Hawari, author
Balai Penerbit Fakultas Kedokteran Universitas Indonesia, 2006
Buku Teks
Hahn,Milton E.
McGraw-Hill Book Co., 1955
Buku Teks