APA Alıntı

Brooke, H., & Helen Brooke. (1999). U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press.

Chicago Stili Alıntı

Brooke, Helen, ve Helen Brooke. U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press, 1999.

MLA Alıntı

Brooke, Helen, ve Helen Brooke. U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press, 1999.