Currier, Glenn
Harcourt, college Pub., 1997
Buku Teks
Collins, Randall
Oxford University Press , 1992
Buku Teks
Ritzer, George
McGraw-Hill, 2012
Buku Teks
Heinemann Educational Books , 1973
Buku Teks
edited by Lewis A. Coser, Bernard Rosenberg
Macmillan, 1964
Buku Teks