Finkle, J. (1998). Viagra heats up war among firms promising cure for impotence. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFinkle, Jim. "Viagra Heats Up War Among Firms Promising Cure for Impotence." Manila Times 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFinkle, Jim. "Viagra Heats Up War Among Firms Promising Cure for Impotence." Manila Times, 1998.
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