Kershaw, Kenneth A., author
Cambridge University Press , 1985
Buku Teks
edited by David J. Galloway
Clarendon Press, 1991
Buku Teks
Louw, Gideon N., author
Longman Scientific and Technical, 1993
Buku Teks
Larcher, W.
Springer-Verlag, 1975
Buku Teks
Dobson, Frank S., author
Richmond, 1992
Buku Teks