APA (7th ed.) Citation

Philippine Postal Corporation. The New ZIP code of the Philippines. Philippine Postal Corporation.

Chicago Style (17th ed.) Citation

Philippine Postal Corporation. The New ZIP Code of the Philippines. [Manila]: Philippine Postal Corporation.

MLA (9th ed.) Citation

Philippine Postal Corporation. The New ZIP Code of the Philippines. Philippine Postal Corporation.

Warning: These citations may not always be 100% accurate.