Robson, William Alexander, 1895-1980, author
Stevens & Sons Limited, 1951
Buku Teks
Phillips, O. Hood
Swett and Maxwell, 1973
Buku Teks
Phillips, O. Hood
Sweet & Maxwell, 1987
Buku Teks
Schwartz, Bernard, author
Little, Brown & Co., 1980
Buku Teks
Andersen, William R., author
Carolina Academic Press, 2010
Buku Teks