De Leon, S. Y. (1980). Guide to research and scientific reporting (Rev. and enlarged ed.). Merriam School and Office Supplies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDe Leon, Sonia Y. Guide to Research and Scientific Reporting. Rev. and enlarged ed. Manila: Merriam School and Office Supplies, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDe Leon, Sonia Y. Guide to Research and Scientific Reporting. Rev. and enlarged ed. Merriam School and Office Supplies, 1980.
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