Houghton Mifflin , 1974
Buku Teks
Bruce, Vicki
Psychology Press, 1996
Buku Teks
Gregory, R. L., author
McGraw-Hill, 1973
Buku Teks
Maureen, Cindy, author
Fakultas Teknik Universitas Indonesia, 2011
UI - Skripsi (Open)
Ruesch, Jurgen
UCLA, 1970
Buku Teks