Etienne van de Valle (adapted by), from the French section edited by Louis Henry (1982). "Fecundity". Multilingual demographic dictionary, English section, second edition. Demopaedia.org, International Union for the Scientific Study of Population. p. 621-1. Archived from the original on 11 February 2010. Retrieved 8 February 2010. {{cite web}}: |author= has generic name (help)
Etienne van de Valle (adapted by), from the French section edited by Louis Henry (1982). "Fecundity". Multilingual demographic dictionary, English section, second edition. Demopaedia.org, International Union for the Scientific Study of Population. p. 621-1. Archived from the original on 11 February 2010. Retrieved 8 February 2010. {{cite web}}: |author= has generic name (help)