Tongko, P. L. (1982). The Philippine government: The fourth Republic under the 1973 constitution as amended (1981 edition.). R.P. Garcia Publishing Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTongko, Primo L. The Philippine Government: The Fourth Republic Under the 1973 Constitution as Amended. 1981 edition. Quezon City: R.P. Garcia Publishing Company, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTongko, Primo L. The Philippine Government: The Fourth Republic Under the 1973 Constitution as Amended. 1981 edition. R.P. Garcia Publishing Company, 1982.
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