APA (7th ed.) Citation

(2001). Zamboanga del Sur. Groundwater Publications and Research Corp.

Chicago Style (17th ed.) Citation

Zamboanga Del Sur. Makati City: Groundwater Publications and Research Corp, 2001.

MLA (9th ed.) Citation

Zamboanga Del Sur. Groundwater Publications and Research Corp, 2001.

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