Del Callar, C. (2007). Solidarity: The key to NPC strength. Philippine Star.
Chicagoスタイル(17版)引用形式Del Callar, Cyril. "Solidarity: The Key to NPC Strength." Philippine Star 2007.
MLA(9版)引用形式Del Callar, Cyril. "Solidarity: The Key to NPC Strength." Philippine Star, 2007.
警告: この引用は必ずしも正確ではありません.