@book{54484,
	author = {De Greeff, Étienne},
	title = {Aux sources de l'humain...},
	editor = {impr. Plon},
	publisher = {Plon},
	year = {1949},
	series = {Présences},
	address = {Paris},
	url = {http://gallica.bnf.fr/ark:/12148/bpt6k3406473p}
}