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

المؤلفون: Bell, John D, Fay, Michael T

المصدر: New Zealand dental journal, Oct 1990; v.86 n.386:p.86-89

المؤلفون: McCormick, Ross

المصدر: New Zealand family physician, Spr 1988; v.15 n.4:p.154-157