APA (7th ed.) Citation

United States. Soil Conservation Service. (1986). Drop spillways. Water Resources Publications.

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. Drop Spillways. Littleton, Colo.: Water Resources Publications, 1986.

MLA (8th ed.) Citation

United States. Soil Conservation Service. Drop Spillways. Water Resources Publications, 1986.

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