Dyfyniad APA

Winters,L Alan, & Sapsford,David. (1990). Primary commodity prices: Economic models and policy. Cambridge University Press.

Dyfyniad Arddull Chicago

Winters,L Alan, and Sapsford,David. Primary Commodity Prices: Economic Models and Policy. Cambridge: Cambridge University Press, 1990.

Dyfyniad MLA

Winters,L Alan, and Sapsford,David. Primary Commodity Prices: Economic Models and Policy. Cambridge University Press, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.