Oxford University Press, 1990
Buku Referensi
edited by George McDaniel
McGraw-Hill, 1994
Buku Referensi
Oxford University Press, 1983
Buku Referensi
Vollnhals, Otto
Elsevier, 1984
Buku Referensi
Dyson, Peter, author
Arcan, 1997
Buku Referensi
edited by Sybil P. Parker
New York, McGraw-Hill
Buku Referensi