Estupigan, R. (1997). Secrets of effective study habits. Manila Bulletin.
Chicagoスタイル(17版)引用形式Estupigan, Ruth. "Secrets of Effective Study Habits." Manila Bulletin 1997.
MLA(9版)引用形式Estupigan, Ruth. "Secrets of Effective Study Habits." Manila Bulletin, 1997.
警告: この引用は必ずしも正確ではありません.