Chun, Wei Choo
Oxford university press, 1998
Buku Teks SO
Machin, John L.J.
McGraw-Hill, 1980
Buku Teks SO
May, John
McGraw-Hill , 1983
Buku Teks SO
edited by Linda L. Putnam, Michael E. Pacanowsky
Sage, 1983
Buku Teks SO
O`Hair, Dan
Kencana, 2009
Buku Teks SO