Source: https://www.researchgate.net/profile/Alidou_Ouedraogo/publication/278017205_Seniors_et_Tourisme_la_place_du_web_20_dans_la_recherche_d'information/links/57effcb208ae886b89754270/Seniors-et-Tourisme-la-place-du-web-20-dans-la-recherche-dinformation.pdf