APA (7th ed.) Citation

United States. Soil Conservation Service. (1980). Conservation tillage systems. Soil Conservation Service, U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. Conservation Tillage Systems. Madison, Wis.: Soil Conservation Service, U.S. Dept. of Agriculture, 1980.

MLA (9th ed.) Citation

United States. Soil Conservation Service. Conservation Tillage Systems. Soil Conservation Service, U.S. Dept. of Agriculture, 1980.