Phaidon Press, 1945
Buku Referensi
Gor`kiy, Aleksey Maksimovich
Foreign Languages Publishing, [date of publication not identified]
Buku Teks
edited by Gregory A. Kimble, Michael Wertheimer, Charlotte White
American Psychological Association, 1991
Buku Teks
Stewart, Ian Charles
Pranawajati, 1990
Buku Referensi
Foreign Languages Press, 1956
Buku Teks