APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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