edited by, wilbur Schramm and Daniel Lerner
An East-West Center Book, 1978
Buku Teks
edited by Gesina H.J. van der Molen, Willem Petrus Josef Pompe, J.H.W. Verzyl
Nederlandse Studentenvereniging, 1956
Buku Teks
Cattell, David T.
University of California Press, 1957
Buku Teks
Jackson, Gabriel
Princeton University Press, 1972
Buku Teks
Avon Book Division, 1961
Buku Teks