Perpeña, E. C. (2001). Improving cell phone services. Manila Times.
Chicagoスタイル(17版)引用形式Perpeña, Ed C. "Improving Cell Phone Services." Manila Times 2001.
MLA(9版)引用形式Perpeña, Ed C. "Improving Cell Phone Services." Manila Times, 2001.
警告: この引用は必ずしも正確ではありません.