APA (7th ed.) Citation

(1961). Isabela, Negros, Philippines. Board of Technical Surveys and Maps.

Chicago Style (17th ed.) Citation

Isabela, Negros, Philippines. Manila: Board of Technical Surveys and Maps, 1961.

MLA (9th ed.) Citation

Isabela, Negros, Philippines. Board of Technical Surveys and Maps, 1961.

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