Erikson, Erik H.
W.W Norton and Company, 1958
Buku Teks
Thorndike, Edward Lee
Harvard University Press, 1943
Buku Teks
Highet, Gilbert, author
Columbia University Press, 1954
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2013
UI - Skripsi (Membership)
Richa Mandasari, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)