Burrington, Gillian A.
Pergamon Press, 1972
Buku Teks
Maizell, Robert E.
John Wiley & Sons, 1979
Buku Referensi
Pemberton, John E.
Pergamon Press, 1969
Buku Teks
Mann, Thomas
Oxford University Press, 2005
Buku Teks
Cohen, Morris L.
West Publishing Co., 1989
Buku Teks