Schmitt, Neal W., author
South-Western Publishing, 1991
Buku Teks
edited by Edwin A. Fleishman
Dorsey Press, 1967
Buku Teks
Fulmer, Robert M., author
Richard D. Irwin , 1983
Buku Teks
Lovejoy, Laurence C., author
Aleander Hamilton Institute, 1962
Buku Teks
edited by Joseph F. McCloskey, Florence N. Trefethen
John Hopkins Press, 1954
Buku Teks