Ostring, P. (2008). Profit focussed supplier management. Prentice Hall of India.
Dyfyniad Arddull ChicagoOstring, Pirkko. Profit Focussed Supplier Management. New Delhi: Prentice Hall of India, 2008.
Dyfyniad MLAOstring, Pirkko. Profit Focussed Supplier Management. Prentice Hall of India, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.