Pineno, C.J.
Addison-Wesley, 1984
Buku Teks SO
Fess, Philip E.
South-Western Publishing , 1993
Buku Teks
Helmkamp, John G.
John Wiley & Sons, 1989
Buku Teks
Niswonger, Clifford Rollin, 1907-
South-Western Pub., Co. , 1977
Buku Teks
Hosch, Gordon A.
Prentice-Hall, 1979
Buku Teks