Whitcut, J. (2002). Better Wordpower. Oxford University Press.
Chicago Style (17th ed.) ZitazioaWhitcut, Janet. Better Wordpower. New Delhi: Oxford University Press, 2002.
MLA (9th ed.) ZitazioaWhitcut, Janet. Better Wordpower. Oxford University Press, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.