Williams, A. (2013). Research: Improve your reading and referencing skills. HarperCollins.
Chicago Style aipamenaWilliams, Anneli. Research: Improve Your Reading and Referencing Skills. London: HarperCollins, 2013.
MLA aipamenaWilliams, Anneli. Research: Improve Your Reading and Referencing Skills. HarperCollins, 2013.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.