APA引文

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引文

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