Citazione APA

Singh, H. P., & Tripathi, R. P. (2008). Soil erosion and conservation.

Stile di citazione Chicago

Singh, H P., e R P. Tripathi. Soil Erosion and Conservation. Newdelhi, Newage, 2008.

Citazione MLA

Singh, H P., e R P. Tripathi. Soil Erosion and Conservation. 2008.