GRE 2000: http://www.tc.gc.ca/canutec/erg_gmu/ergspanish.htm

CANUTEC's ERGO: http://www.tc.gc.ca/canutec/en/GUIDE/ERGO/ergo.htm

Occupational Safety and Health Administration - OSHA HOME PAGE: http://http://www.osha.gov/

DRÄGER: http://www.draeger.com/english/index.htm