Villegas, B. M. (2001). The crisis of childless societies. Manila Bulletin.
Chicagoスタイル(17版)引用形式Villegas, Bernardo M. "The Crisis of Childless Societies." Manila Bulletin 2001.
MLA(9版)引用形式Villegas, Bernardo M. "The Crisis of Childless Societies." Manila Bulletin, 2001.
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