Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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