1. US Department of Health and Human Services. The Surgeon General's call to action to prevent skin cancer 2014. Available from: URL: http://www.surgeongeneral.gov/library/calls/prevent-skin-cancer/. Accessed July 30, 2014.
2. A reference action spectrum for ultra-violet induced erythema in human skin;McKinlay,1987
3. Davis Instruments Corporation. Interpreting UV readings. Available from: URL: http://www.davisnet.com/product_documents/weather/app_notes/93004_306-AN_06-interpret-uv-readings.pdf. Accessed October 6, 2014.
4. Environment Canada. UV Index Definition. Available from: URL: http://es-ee.tor.ec.gc.ca/e/ozone/uv_index_definition.htm. Accessed October 6, 2014.
5. Tanning facility use: are we exceeding Food and Drug Administration limits?;Hornung;J Am Acad Dermatol,2003