Scoles, Eugene F.
West Publishing, 1967
Buku Teks
Mehren, Arthur Taylor von
Little, Brown, 1965
Buku Teks
Collier, John Greenwood
Cambridge University Press, 1987
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Hay, Peter
West Publishing, 1994
Buku Teks
Ehrenzweig, Albert A.
West Publishing, 1959
Buku Teks