APA (7th ed.) Citation

Sharpe, C. F. S. (1938). What is soil erosion? U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

Sharpe, C. F. Stewart. What Is Soil Erosion? Washington, D.C: U.S. Dept. of Agriculture, 1938.

MLA (9th ed.) Citation

Sharpe, C. F. Stewart. What Is Soil Erosion? U.S. Dept. of Agriculture, 1938.