Agnes Veronica Christy, author
Fakultas Psikologi Unversitas Indonesia, 2015
UI - Skripsi (Membership)
Wood, Julia T., 1950-, author
Salemba Humanika, 2013
Buku Teks
Floyd, Kory, author
Mc Graw Hill, 2012
Buku Teks
Hartley, Peter, 1946-, author
Roudledge, 1993
Buku Teks
Condon, John C., author
Macmillan, 1977
Buku Teks