Belote, James H.
Harper & Row Publishers, 1967
Buku Teks
Olmsted, John M. H.
Appleton-Century-Crofts, 1968
Buku Teks
Edwards, Eric J., author
The Law Book Company , 1981
Buku Teks
Edwards, Eric J., author
Law Book Company, 1988
Buku Teks
Lockhart, William B., author
West , 1967
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