(1997). Implementing rules and regulations of the government service insurance system act of 1997. Manila Bulletin.
Chicago-viite (17. p.)"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin 1997.
MLA-viite (9. p.)"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin, 1997.
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