APA (7th ed.) Citation

Philippines. Department of Environment and Natural Resources. (1990). Revised water usage and classification.

Chicago Style (17th ed.) Citation

Philippines. Department of Environment and Natural Resources. Revised Water Usage and Classification. 1990.

MLA (9th ed.) Citation

Philippines. Department of Environment and Natural Resources. Revised Water Usage and Classification. 1990.

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