Isherwood, Millicent M.
Chambers, 1986
Buku Teks
Kottke, Frederic J., author
W.B. Saunders Company, 1990
Buku Referensi
Orto, Arthur E. Dell, editor
Macmillan Lib., 1995
Buku Referensi
Yanti Damayanti, author
1997
UI - Tesis (Membership)
Widarsri, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi (Membership)