Baines, P., Fill, C., & Page, K. (2011). Marketing. Oxford: Oxford: Oxford University Press.
Crawford, E. (2015). Nutrition and health bars expand market share by tying into wellness, athleticism. Retrieved from: http://www.foodnavigator-usa.com/Markets/Nutrition- bars-expand-market-share-by-tying-into-wellness-athleticism
Lamb, C., Hair, J. Mcdaniel, C. (2012). Essentials of marketing. 7th ed. Mason: Cengage Learning.
Lewis, A. (2009). Sales of high-protein bars continue to climb as others stall. Retrieved from: http://www.cspdailynews.com/sites/default/files/magazine-files/F4- keepingproteinbarhigh.pdf