Gibson, A. B., author
Longmans, 1947
Buku Teks
Dubois, Bernard, author
Prentice-Hall, 2000
Buku Teks
Walle, Alf H., author
Quorum Books, 2001
Buku Teks
Fakultas Psikologi Universitas Indonesia, 1982
UI - Skripsi (Membership)
Elly Irawati, author
1981
UI - Skripsi (Membership)