Brooke, H., & Helen Brooke. (1999). U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press.
Chicago Style CitationBrooke, Helen, and Helen Brooke. U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press, 1999.
MLA CitationBrooke, Helen, and Helen Brooke. U.F.O.S. Oxford Bookworms Factfiles: Oxford University Press, 1999.
Warning: These citations may not always be 100% accurate.