APA aipamena

Macintosh, M. C., & Chard, T. (1994). Prenatal screening for trisomy 18. Most die before or just after birth. BMJ Group.

Chicago Style aipamena

Macintosh, M. C., and T. Chard. Prenatal Screening for Trisomy 18. Most Die Before or Just After Birth. BMJ Group, 1994.

MLA aipamena

Macintosh, M. C., and T. Chard. Prenatal Screening for Trisomy 18. Most Die Before or Just After Birth. BMJ Group, 1994.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.