Reese, Willis L.M.
Foundation Press, 1971
Buku Teks
Mehren, Arthur Taylor von
Little, Brown, 1965
Buku Teks
Hay, Peter
West Publishing, 1994
Buku Teks
Ehrenzweig, Albert A.
West Publishing, 1959
Buku Teks
Collier, John Greenwood
Cambridge University Pers, 1994
Buku Teks