Battle, J.A.
Mutiara, 1978
Buku Teks
Rakes, Thomas A., author
Allyn and Bacon, 1990
Buku Teks
Prima E. Delta, author
Fakultas Psikologi Universitas Indonesia, 2007
UI - Skripsi (Membership)
Fenesha Flourencia Effraim Mirah, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)
Prianka Diany Kinanti, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)