Keeton, Robert E., author
West Publishing, 1960
Buku Teks
Keeton, Robert E., author
West Publishing, 1988
Buku Teks
Browne, Ray B., author
Bowling Green State University, 1986
Buku Teks
Sloan, Irving J.
Oceana Publications, 1987
Buku Teks
Bunnin, Brad
Parker Street, 1983
Buku Teks