Crystal ,David. (1971). Linguisics. Penguin Books, England.
Chicago Style aipamenaCrystal ,David. Linguisics. Penguin Books, England: Penguin Books, England, 1971.
MLA aipamenaCrystal ,David. Linguisics. Penguin Books, England, 1971.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.