Finkle, J. (1998). Viagra heats up war among firms promising cure for impotence. Manila Times.
芝加哥风格引文Finkle, Jim. "Viagra Heats Up War Among Firms Promising Cure for Impotence." Manila Times 1998.
MLA引文Finkle, Jim. "Viagra Heats Up War Among Firms Promising Cure for Impotence." Manila Times, 1998.
警告：这些引文格式不一定是100％准确.