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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPhilippines (Republic). Government Service Insurance System. Basic Laws of the Government Service Insurance System. Manila: [s.n.], 1968.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPhilippines (Republic). Government Service Insurance System. Basic Laws of the Government Service Insurance System. [s.n.], 1968.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.