Scher, J. (1985). Pregnancy everything you need to know. penguin Books.
Chicago Style aipamenaScher, Jonathan. Pregnancy Everything You Need to Know. Great Britain: penguin Books, 1985.
MLA aipamenaScher, Jonathan. Pregnancy Everything You Need to Know. penguin Books, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.