المؤلفون: Brennan, Stacey, Rosenberger, Philip J III, Hementera, Veronica
المصدر: Marketing bulletin (Massey University. Dept of Marketing), 2004; n.15:p.16p
URL الوصول: http://marketing-bulletin.massey.ac.nz/V15/MB_V15_A1_Brennan.pdf