Cita APA (7th ed.)

Government service Insurance System. (1937). Prospectus and basic rules. Bureau of Printing.

Cita Chicago (17th ed.)

Government service Insurance System. Prospectus and Basic Rules. Manila: Bureau of Printing, 1937.

Cita MLA (9th ed.)

Government service Insurance System. Prospectus and Basic Rules. Bureau of Printing, 1937.