APA ציטוט

Klass, M. W., & Landis, R. C. (1980). OPEC: Policy implications for the United States.

Chicago Edition Citation

Klass, Michael W., and Robin C. Landis. OPEC: Policy Implications for the United States. New York, Praeger publishers, 1980.

ציטוט MLA

Klass, Michael W., and Robin C. Landis. OPEC: Policy Implications for the United States. 1980.