Lavine, A. Lincoln
H. M. Rowe Co., 1959
Buku Teks
Beatty, Jeffrey F.
Thomson, South-Western, 2003
Buku Teks
Cheeseman, Henry R., author
Prentice-Hall, 1998
Buku Teks
Brown, Gordon W.
McGraw-Hill , 1984
Buku Teks
Simpson, Laurence P., author
Alexander Hamilton Institute, 1961
Buku Teks