Foreign Service Institute. (1981). Philippine treaties index: A list of treaties and other international agreements of the Republic of the Philippines as of 31 December 1980. Foreign Service Institute.
Chicago Style (17th ed.) CitationForeign Service Institute. Philippine Treaties Index: A List of Treaties and Other International Agreements of the Republic of the Philippines as of 31 December 1980. Manila: Foreign Service Institute, 1981.
MLA (9th ed.) CitationForeign Service Institute. Philippine Treaties Index: A List of Treaties and Other International Agreements of the Republic of the Philippines as of 31 December 1980. Foreign Service Institute, 1981.
Warning: These citations may not always be 100% accurate.