Source: https://www.researchgate.net/profile/Catherine_Aubertin/publication/32988711_Histoire_et_creation_d'une_region_sous-developpee_le_Nord_Ivoirien/links/560d14a808ae9755d9731eff/Histoire-et-creation-dune-region-sous-developpee-le-Nord-Ivoirien.pdf