1. Alliance for Audited Media. (2012). Top 25 U.S. consumer magazines by total paid and verified circulation.Top 25 U.S. Consumer Magazines for June 2012. Retrieved from http://www.auditedmedia.com/news/research-and-data/top-25-us-consumer-magazines-for-june-2012.aspx
2. American Dietetic Association. (2011).Nutrition and you: Trends 2011. Retrieved from http://www.eatright.org/WorkArea/linkit.aspx?LinkIdentifier=id&ItemID=6442465468&libID=6442465450
3. Association of Magazine Media. (2010).Magazine handbook, Engagement to action. A comprehensive guide and factbook 2010/11. Retrieved from http://yellowscene.com/public-files/2010-11-MPA-Handbook.pdf
4. Association of Magazine Media. (2011).Magazine media factbook 2011/12. Retrieved from http://www.magazine.org/sites/default/files/factbook-2012.pdf
5. Berelson, B. (1971).Content analysis in communications research(pp. 98–108). New York, NY: Hafner.