APA (7th ed.) Citation

Tolley, H. R. (1918). The efficient operation of thrashing machines. U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

Tolley, H. R. The Efficient Operation of Thrashing Machines. Washington, D.C: U.S. Dept. of Agriculture, 1918.

MLA (9th ed.) Citation

Tolley, H. R. The Efficient Operation of Thrashing Machines. U.S. Dept. of Agriculture, 1918.