Cohen, Morris L.
West Publishing Co., 1989
Buku Teks
Foster, Lynn
West Publishing Company, 1983
Buku Teks
Berring, Robert C.
Thomson/West, 2005
Buku Teks
Mann, Thomas
Oxford University Press, 2005
Buku Teks
Tierney, Kevin
Oceana Publication, 1971
Buku Teks