Asch, Peter
John Wiley & Sons, 1983
Buku Teks
Mund, Vernon A., author
Appleton-Century-Crofts, 1971
Buku Teks
Weaver, Suzanne
MIT Press, 1978
Buku Teks
edited by Sylvester E. Berki
Health, 1966
Buku Teks
edited by Werner Sichel
Ann Arbor, 1970
Buku Teks