APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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