"Rip Current Characteristics". College of Earth, Ocean, and Environment, University of Delaware. Archived from the original on 26 July 2013. Retrieved 16 January 2009.
"Rip Current Characteristics". College of Earth, Ocean, and Environment, University of Delaware. Archived from the original on 26 July 2013. Retrieved 16 January 2009.
"Rip Currents". United States Lifesaving Association. Archived from the original on 29 December 2010. Retrieved 8 July 2009.