Source: https://www.researchgate.net/profile/Said-El-Moustafid/publication/312918973_Methodologie_de_recherche_par_etude_de_cas_dans_les_sciences_de_gestion_au_Maroc/links/5889d3a84585157012036217/Methodologie-de-recherche-par-etude-de-cas-dans-les-sciences-de-gestion-au-Maroc.pdf