Cita APA (7th ed.)

Philippines (Republic). Government Service Insurance System. (1968). Basic reference manual, 1967-68. s.n.].

Cita Chicago (17th ed.)

Philippines (Republic). Government Service Insurance System. Basic Reference Manual, 1967-68. [Manila: s.n.], 1968.

Cita MLA (9th ed.)

Philippines (Republic). Government Service Insurance System. Basic Reference Manual, 1967-68. s.n.], 1968.