De Leon, H. S. (1977). Handbook on insurance and sales, with Insolvency law (1977 ed.). National Book Store.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDe Leon, Hector S. Handbook on Insurance and Sales, with Insolvency Law. 1977 ed. Manila: National Book Store, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDe Leon, Hector S. Handbook on Insurance and Sales, with Insolvency Law. 1977 ed. National Book Store, 1977.
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