Crisostomo, I. T. (2002). The president as salesperson and manager. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrisostomo, Isabelo T. "The President as Salesperson and Manager." Manila Bulletin 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCrisostomo, Isabelo T. "The President as Salesperson and Manager." Manila Bulletin, 2002.
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