Lasher, William R., author
Western College Publishing , 2000
Buku Teks
Brigham, Eugene F., 1930-, author
Dryden Press, 1985
Buku Teks
Bradley, Joseph F., author
Holt, Rinehart and Winston, 1969
Buku Teks
Bradley, Joseph F., author
Dryden Press, 1974
Buku Teks
Curran, Ward S.
McGraw-Hill, 1970
Buku Teks