RATAN, L. (1990). SOIL EROSION IN THE TROPICS: PRINCIPLES AND MANAGEMENT. MCGRAW HILL BOOK CO.
Lua i Stíl Chicago (17ú heag.)RATAN, LAL. SOIL EROSION IN THE TROPICS: PRINCIPLES AND MANAGEMENT. NEW-YORK: MCGRAW HILL BOOK CO, 1990.
Lua MLA (9ú heag.)RATAN, LAL. SOIL EROSION IN THE TROPICS: PRINCIPLES AND MANAGEMENT. MCGRAW HILL BOOK CO, 1990.
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