(1997). Implementing rules and regulations of the government service insurance system act of 1997. Manila Bulletin.
Chicago Style (17. basım) Atıf"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin 1997.
MLA (9th ed.) Atıf"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin, 1997.
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