APA (7th ed.) Citation

Wittren, R. A. (1976). Power steering for agricultural tractors. American Society of Agricultural Engineers.

Chicago Style (17th ed.) Citation

Wittren, R. A. Power Steering for Agricultural Tractors. St. Joseph, Mi: American Society of Agricultural Engineers, 1976.

MLA (9th ed.) Citation

Wittren, R. A. Power Steering for Agricultural Tractors. American Society of Agricultural Engineers, 1976.

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