Schwitzgebel, Ralph K
McGraw-Hill Kogakusha, 1974
Buku Teks
Stella Bunga Parmawati, author
Fakultas Psikologi Universitas Indonesia, 2012
UI - Tesis Open
Wadsworth , 1970
Buku Teks
Watson, David L., author
Brooks/Cole , 1985
Buku Teks
Prentice-Hall, 1976
Buku Teks