(2002). Synthetic hormone lowers ovarian cancer risk - study. Manila Bulletin.
Chicago Style aipamena"Synthetic Hormone Lowers Ovarian Cancer Risk - Study." Manila Bulletin 2002.
MLA aipamena"Synthetic Hormone Lowers Ovarian Cancer Risk - Study." Manila Bulletin, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.