O., S., G. et al.(1996).Soil and water management systems / Glenn O. Schwab, Delmar D. Fangmeier, William J. Elliot (Ed.ke-4).New York:John Wiley n Sons.
Gaya MLA
Schwab, Glenn, O.. et al."Soil and water management systems / Glenn O. Schwab, Delmar D. Fangmeier, William J. Elliot".Ed.ke-4New York:John Wiley n Sons,1996.Textbook.