Wallace, Walter L.
Aldine publishing, 1970
Buku Teks
Currier, Glenn
Harcourt, college Pub., 1997
Buku Teks
Collins, Randall, author
Oxford University Press , 1992
Buku Teks
Ritzer, George, author
McGraw-Hill, 2012
Buku Teks
edited by Kenneth Thomson and Jeremy Tunstall
Penguin Books, 1983
Buku Teks