Brace, C. Loring
Prentice-Hall, 1979
Buku Teks
Ashcraft, Mark H.
Harper Collins, 1994
Buku Teks
Barnard, Alan
Cambridge University Press, 2011
Buku Teks
Henderson-Sellers, B.
John Wiley & Sons, 1987
Buku Teks
Howes, Mary B.
Pergamon Press , 1990
Buku Teks