Source: https://www.researchgate.net/profile/Jacques_Gleyse/publication/263809878_trema-2735-37-corps-laiques-ou-corps-religieux-une-analyse-des-manuels-scolaires-de-morale-au-xxe-siecle/data/02e7e53bf01218537c000000/trema-2735-37-corps-laiques-ou-corps-religieux-une-analyse-des-manuels-scolaires-de-morale-au-xxe-siecle.pdf