Adams, Katherine H.
Mayfield Publishing Company, 2000
Buku Teks SO
Sardar, Ziauddin
Icon Books, 2000
Buku Teks SO
Sardar, Ziauddin
Mizan, 2001
Buku Teks SO
edited by John A. Moses
University of Queensland Press, 1979
Buku Teks SO
Bazerman, Charles
Houghton Miffiln, 1985
Buku Teks SO