Kleiman, Carol. THE 100 BEST JOBS FOR THE 1990's & BEYOND, Dearborn Financial Publishing, Inc, USA, 1992.

Evans, Stuart. PROFEESIONAL AND TECHNICAL CAREERS, Worldbook, Chicago, 1998.

Internet Sites

http://www.careercity.com http://www.golden.net http://www.adm.uwaterloo.ca:80/infococs/CRC/manu"