Gaya APA

Schiff, M., Valdes, A. (1992). The Political Economy of Agricultural Pricing Policy (Volume 4). United States of America: John Hopskins University Press.

Gaya MLA

Schiff, Maurice., Valdes, Alberto. "The Political Economy of Agricultural Pricing Policy". Volume 4 United States of America: John Hopskins University Press, 1992. Textbook.