APA aipamena

Ray, G. F. (1975). Western Europe and the energy crisi. London: Trade Policy Research Centre.

Chicago Style aipamena

Ray, George F. Western Europe and the Energy Crisi. London: Trade Policy Research Centre, 1975.

MLA aipamena

Ray, George F. Western Europe and the Energy Crisi. London: Trade Policy Research Centre, 1975.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.