APA aipamena

Harrison, M., & Kerr, R. (1997). First certificate practice tests. New York: Oxford University Press.

Chicago Style aipamena

Harrison, Mark., và Rosalie Kerr. First Certificate Practice Tests. New York: Oxford University Press, 1997.

MLA aipamena

Harrison, Mark., và Rosalie Kerr. First Certificate Practice Tests. New York: Oxford University Press, 1997.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.