Hocket,Homer Carey
Macmillan, 1939
Buku Teks
Williams, Jerre S.
West Publishing Company, 1979
Buku Teks
Tribe, Laurence H., author
Foundation Press, 1978
Buku Teks
Mitchell, Broadus, author
Oxford University Press, 1964
Buku Teks
Schawartz, Bernard, author
At The University Press, 1955
Buku Teks