APA引文

United States. Soil Conservation Service. Erosion in Washington: Causes and effects. s.n..

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. Erosion in Washington: Causes and Effects. [United States: s.n..

MLA引文

United States. Soil Conservation Service. Erosion in Washington: Causes and Effects. s.n..

警告：這些引文格式不一定是100％准確.