||Snyder WS, Cook MJ, Nasset ES, Karhausen LR, Howells GP, Tipton IH. Report of the Task Group on Reference Man. Oxford, United Kingdom: Pergamon Press, 1975. International commission on radiological protection, ICRP Publication 23, link p.338 bottom sentence
||P.338 3rd paragraph: "B. Energy expenditure: Food and oxygen are consumed in proportion to energy requirements and are influenced by sex, size, age, environmental temperature, and activity. Data for calculation of calorie requirements, oxygen consumption, and carbon dioxide production are given below."