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The following is an early estimate of the percent oxygen in humans:
- “The human body contains carbon 13.5%, hydrogen 9.1%, oxygen 72%, nitrogen 2.5%, phosphorus 1.15%, sodium 0.1 %, calcium 1.3%, magnesium 0.001%, iron 0.01%, and traces of silicon and fluorine.”
- — Carl Kelsey (1916), The Physical Basis of Society (pg. 7) 
The following are quotes on oxygen:
- “Why should a group of simple, stable compounds of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N), 'struggle' for billions of years to organize themselves into a professor of chemistry? What's the motive?”
- Oxygen – Giphy.com.
- Kelsey, Carl. (1916). The Physical Basis of Society (pg. 7). D. Appleton and Company.
- Thims, Libb. (2008). The Human Molecule (GB) (Amz) (Iss) (elemental composition table, pgs. 52-55). LuLu.
- Pirsig, Robert M. (1991). Lila: An Inquiry into Morals (struggle, 5+ pgs; quote, pg. 162). Random House, 2013.
- Oxygen – Hmolpedia 2020.