Madura, Jeff
South-Western College, 1998
Buku Teks SO
Madura, Jeff
Thomson South-Western, 2003
Buku Teks SO
O`Connor, Dennis J.
Macmillan, 1990
Buku Teks SO
Eun, Cheol S.
McGraw-Hill/Irwin, 2004
Buku Teks SO
Henning, Charles W.
McGraw-Hill Kogakusha, 1978
Buku Teks SO