McCormick, Charles T. (Charles Tilford), 1889-1963
West Publishing, 1935
Buku Teks
Warr, George
Sweet & Maxwell, 1994
Buku Teks
Hales, Michael G.
Prentice-Hall, 198
Buku Teks
Prosser, William L.
West Publishing, 1971
Buku Teks
Ross, Martin J.
A Fawcett Crest Book, 1975
Buku Teks