(1997). Implementing rules and regulations of the government service insurance system act of 1997. Manila Bulletin.
Chicago Style aipamena"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin 1997.
MLA aipamena"Implementing Rules and Regulations of the Government Service Insurance System Act of 1997." Manila Bulletin, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.