APA (7th ed.) Citation

(1975). Postal code system directory of the Philippines. Philippine Postal Service.

Chicago Style (17th ed.) Citation

Postal Code System Directory of the Philippines. Manila: Philippine Postal Service, 1975.

MLA (9th ed.) Citation

Postal Code System Directory of the Philippines. Philippine Postal Service, 1975.

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