Gunther, Gerald, author
Foundation Press, 1970
Buku Teks
Dodd, E. Merrick, author
Foundation Press, 1951
Buku Teks
Lawler, J. John, author
Foundation Press, 1940
Buku Teks
Boswell, Richard A., author
Carolina Academic Press, 1992
Buku Teks
West Publishing, 1995
Buku Teks