UNICRI, 1990
Buku Teks
Mellor, John W., author
Cornell University Press, 1966
Buku Teks
edited by Clifton R. Wharton
Aldine Publishig, 1969
Buku Teks
edited by Melvin G. Blase
Iowa State University Press, 1971
Buku Teks
Pitt, David C., author
Pergamon Press, 1976
Buku Teks