Tan, R. L. (1998). When does a charitable donation become a tax deductible act?. IN Tax files [column]. Philippine Daily Inquirer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTan, Roberto L. "When Does a Charitable Donation Become a Tax Deductible Act?. IN Tax Files [column]." Philippine Daily Inquirer 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTan, Roberto L. "When Does a Charitable Donation Become a Tax Deductible Act?. IN Tax Files [column]." Philippine Daily Inquirer, 1998.
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