Heyns, Roger W.
Henry Holt and Company, 1958
Buku Teks
Fenny Hartiani, author
1992
UI - Skripsi (Membership)
Fakultas Psikologi Universitas Indonesia, 1997
UI - Skripsi (Membership)
Sawitri Sjah, author
Fakultas Psikologi Universitas Indonesia, 1998
UI - Skripsi (Membership)
Nurul Rahma, author
Fakultas Psikologi Universitas Indonesia, 1998
UI - Skripsi (Membership)