APA aipamena

Villegas, B. M. (2001). The crisis of childless societies. Manila Bulletin.

Chicago Style aipamena

Villegas, Bernardo M. "The Crisis of Childless Societies." Manila Bulletin 2001.

MLA aipamena

Villegas, Bernardo M. "The Crisis of Childless Societies." Manila Bulletin, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.