Hoffman, William H., author
West Publishing, 1987
Buku Teks
edited by William H. Hoffman
West Publishing, 1988
Buku Teks
Stephens, Richard B., author
Warren, Gorham and Lamont, 1959
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1982
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1984
Buku Teks