Baruss, Imants, author
American Psychological Association, 2003
Buku Teks
Coni Agustin, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi (Open)
Pagel, J.F., author
Academic Press, 2014
eBooks
Keyes, Charles Don
Routledge, 1999
Buku Teks
Rödl, Sebastian, author
Harvard University Press, 2018
Buku Teks