Edited by Craig D. Sandgren
Cambridge University Press, 1991
Buku Teks
Fogg, Gordon Elliott, 1919-
The University ofWisconsin press, 1987
Buku Teks
Mason, C.F.
Pearson Education ltd, 1996
Buku Teks
John, D. M.
Cambridge University Press, 2011
Multimedia
editor, David M. John [and others]
Cambridge University Press, 2011
Buku Referensi