Wiliana, author
Fakultas Psikologi Universitas Indonesia, 2018
UI - Skripsi (Membership)
Centers, Richard, author
Routledge/Thoemmes Press, 1949
Buku Teks
United Nations Educational, Scientific and Cultural Organization, 1977
Buku Teks
edited by Muzafer Sherif and M.O. Wilson
Harper & Brothers, 1953
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis (Membership)