Ibn Kathir (2) Al-qurtubi, Abu 'abdullah Muhammad (2) Nussbaumer Knaflic, Cole, Cisneros, Mike, Velez, Alex (1) Nussbaumer Knaflic, Cole (1) West, Douglas (professor Of Marketing, Ford, John (professor & Eminent Scholar, Ibrahim, Essam (cairo University), Montecchi, Matteo (lecturer In Marketing (1)