John, D. M.
Cambridge University Press, 2011
Multimedia
Reynolds, C.S.
Cambridge University Press, 1993
Buku Teks
Mason, C.F.
Pearson Education ltd, 1996
Buku Teks
Edited by Craig D. Sandgren
Cambridge University Press, 1991
Buku Teks
Mason, C.F.
John Wiley & Sons, 1991
Buku Teks