John Wiley & Sons, 1991
Buku Teks
Huang, Ray.
Cambridge University Press, 1974
Buku Teks
edited by Donald Baker ... [and others]
Columbia University Press , 1993
Buku Teks
Mathias, Peter
Methuen , 1979
Buku Teks
Wightman, W.P D.
Oliver and Boyd, 1962
Buku Teks