Philippines (Republic). Government Service Insurance System. (1970). Basic reference manual. [s.n.].
Citazione stile Chigago Style (17a edizione)Philippines (Republic). Government Service Insurance System. Basic Reference Manual. Manila: [s.n.], 1970.
Citatione MLA (9a ed.)Philippines (Republic). Government Service Insurance System. Basic Reference Manual. [s.n.], 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.