Parmerlee, D. (1993). Selecting the right products and services. NTC Business Books.
Citazione stile Chigago Style (17a edizione)Parmerlee, David. Selecting the Right Products and Services. Lincolnwood, Ill: NTC Business Books, 1993.
Citatione MLA (9a ed.)Parmerlee, David. Selecting the Right Products and Services. NTC Business Books, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.