Schraf, Betty R
Tiara Wacana Yogya, 1995
Buku Teks
Betsy Kurniawati Witarsa, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)
Turner, Bryan S., author
Sage, 1983
Buku Teks
Bouquet, A.C., author
Penguin Books, 1953
Buku Teks
Stein, Rebecca L., author
Pearson Education, 2005
Buku Teks