APA (7th ed.) Zitazioa
Gray, H. P. (1987). International economic problems and policies. ST. Martins Press.
Chicago Style (17th ed.) Zitazioa
Gray, H. Peter. International Economic Problems and Policies. New York: ST. Martins Press, 1987.
MLA (9th ed.) Zitazioa
Gray, H. Peter. International Economic Problems and Policies. ST. Martins Press, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.