Faison, Edmund W.J.
New York, N.Y. John Wiley c. 1980,
Buku Teks
Eijkern, W.J. Van
W.E.J.Tjeenk Willink, 1984
Buku Teks
Sydney University Press, 1974
Buku Teks
McDougall, William, 1871-1938, author
Macmillan, 1966
Buku Teks
Blackie, W.J.
Kadoorie Agriculturak Aid Association, 1972
Buku Teks