Philippine Postal Corporation. The New ZIP code of the Philippines. Philippine Postal Corporation.
Citazione stile Chigago Style (17a edizione)Philippine Postal Corporation. The New ZIP Code of the Philippines. [Manila]: Philippine Postal Corporation.
Citatione MLA (9a ed.)Philippine Postal Corporation. The New ZIP Code of the Philippines. Philippine Postal Corporation.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.