Weinstock, George D., [et.al]
Prentice-Hall, 1971
Buku Teks
Cargan, Leonard
Wadsworth, 1985
Buku Teks
Horton, Paul B.
Dow Jones Irwin, 1982
Buku Teks
Acuff, F. Gene
The Dryden Press, 1973
Buku Teks SO
Peterson, Richard J.
Wadswarth Publishing, 1986
Buku Teks SO