↑ Sarah Zhang (2017-07-27). "Blowing Out Birthday Candles Increases Cake Bacteria by 1,400 Percent: But it's okay, really!". Atlantic magazine. สืบค้นเมื่อ 2017-12-03. On average, blowing out the candles increased the amount of bacteria on the frosting by 14 times. But in one case, it increased the amount of bacteria by more than 120 times. “Some people blow on the cake and they don’t transfer any bacteria. Whereas you have one or two people who really for whatever reason ... transfer a lot of bacteria.” says Dawson.”
↑ Rusinek, Marietta (2012). "Cake:The Centrepiece of Celebrations". Celebration: Proceedings of the Oxford Symposium on Food and Cookery 2011. Oxford: Prospect Books. pp. 308–315.
↑ (The Lore of Birthdays (New York, 1952), Ralph and Adelin Linton, pp. 8, 18-20.)
