American Red Cross Water Safety Instructor - http://www.redcross.org/services/hss/aquatics/wsi.html
American Red Cross Life Guarding - http://www.redcross.org/services/hss/aquatics/
Speedo - http://www.speedo.com
USA Swimming - http://www.usaswimming.org
Physics 211 Homepage - http://ffden-2.phys.uaf.edu/211.html
University of Alaska Fairbanks - http://www.uaf.edu