Schusky, Ernest l.
Prentice-Hall, 1973
Buku Teks
Park, Michael Alan, author
McGraw-Hill, 2003
Buku Teks
Kroeber
Harcourt, Brace and Company, 1948
Buku Teks
Stocking, George W., author
The Free Pres, 1968
Buku Teks
Okely, Judith, author
Routledge, 1996
Buku Teks