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1 Macrae, Fiona. 2009. The unromantic truth about why we kiss: to spread germs. The Daily Mail online. http://www.dailymail.co.uk/health/article-1224249/The-unromantic-truth-kiss--spread-germs.html?ITO=1490. Retrieved 23 November 2012.
2 Schlupp, I., Riesch, R., Tobler, M., Plath, M., Parzefall, J., & Schartl, M. (2010). A novel, sexually selected trait in poeciliid fishes: female preference for mustache-like, rostral filaments in male Poecilia sphenops Behavioral Ecology and Sociobiology, 64 (11), 1849-1855 DOI:10.1007/s00265-010-0996-y
3 http://news.bbc.co.uk/earth/hi/earth_news/newsid_8767000/8767973.stm
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6 Nicholls, Henry. 2011. The Way of the Panda: The Curious History of China’s Political Animal. Open Road Media. 304 pp.
7 Pikitch, E., Boersma, P.D., Boyd, I.L., Conover, D.O., Cury, P., Essington, T., Heppell, S.S., Houde, E.D., Mangel, M., Pauly, D., Plagányi, É., Sainsbury, K., and Steneck, R.S. 2012. Little Fish, Big Impact: Managing a Crucial Link in Ocean Food Webs. Lenfest Ocean Program. Washington, DC. 108 pp.
8 http://www.dailymail.co.uk/health/article-1224249/The-unromantic-truth-kiss--spread-germs.html?ITO=1490

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