Hoffman, William H., author
West Publishing, 1987
Buku Teks
edited by William H. Hoffman
West Publishing, 1988
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1982
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1984
Buku Teks
Hudson, David M., author
St. Paul, Minn, 1994
Buku Teks