APA (7th ed.) Citation

(1970). Key to the photographic interpretation of Philippine agricultural crops. PROS.

Chicago Style (17th ed.) Citation

Key to the Photographic Interpretation of Philippine Agricultural Crops. Quezon City: PROS, 1970.

MLA (9th ed.) Citation

Key to the Photographic Interpretation of Philippine Agricultural Crops. PROS, 1970.

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