Dreitzel, Hans Peter
MacMillan Press , 1971
Buku Teks
Cooley, Charles Horton, author
Schochen Books, 1972
Buku Teks
Nisbet, Robert A., author
Oxford University Press, 1970
Buku Teks
Service, Elman R. (Elman Rogers), 1915-1996, author
Random House, 1971
Buku Teks
Katz, Fred E.
Random House , New York Random House
Buku Teks