Etienne van de Valle and Louis Henry (1982). "Fecundity". Multilingual demographic dictionary, English section, second edition. Demopaedia.org, International Union for the Scientific Study of Population. p. 621-1. Retrieved 8 February 2010.
Bradshaw, C. J. A.; McMahon, C. R. (2008-01-01), "Fecundity", in Jørgensen, Sven Erik; Fath, Brian D. (eds.), Encyclopedia of Ecology, Oxford: Academic Press, pp. 1535–1543, ISBN978-0-08-045405-4, retrieved 2022-11-08