Banton Michael, author
Tavistock Publications, 1969
Buku Teks
Mason, Philip, author
Oxford University Press, 1970
Buku Teks
Walter, Paul A.F., author
McGraw-Hill, 1952
Buku Teks
Parrillo, Vincent N., author
Pearson, 2014
Buku Teks
edited by Edgar T. Thompson, Robert E. Park
Duke University Press, 1939
Buku Teks