Wright, M.G.
Tata McGraw-Hill, 1981
Buku Teks
Bradley, Joseph F.
Holt, Rinehart and Winston, 1969
Buku Teks
Brigham, Eugene F., 1930-
[publisher not identified], [data f publication not identified]
Buku Teks
Gup, Benton E.
John Wiley & Sons, 1987
Buku Teks SO
Brigham, Eugene F., 1930-
The Dryden Press, 1993
Buku Teks SO