O`Brien, James A., 1936-
Richard D. Irwin, 1975
Buku Teks
Fuori, William M.
Prentice-Hall, 1981
Buku Teks
Madura, Jeff
South-Western College, 2001
Buku Teks
Glos, Raymond E.
South-Western Publishing, 1947
Buku Teks
Hastings, Paul G.
McGraw-Hill, 1974
Buku Teks