Louw, Gideon N., author
Longman Scientific and Technical, 1993
Buku Teks
Larcher, W.
Springer-Verlag, 1975
Buku Teks
Macfadyen, A.
Pitman Publishing Corporation, 1963
Buku Teks
edited by Ian R. Swingland and Paul J. Greenwood
Clarendon Press, 1983
Buku Teks
Pandey, B.N., author
Tata McGraw-Hill, 2012
Buku Teks