Rubel, Paula G.
Australian National University Press, 1978
Buku Teks
Hogg, Michael A., 1954-, author
London, 1988
Buku Teks
Burton, John W.
Macmillan & co. LTD, 1969
Buku Teks
edited by Muzafer Sherif and M.O. Wilson
Harper & Brothers, 1953
Buku Teks
Saragih, Mike Wijaya, author
2018
UI - Tesis (Membership)