Schwab, G. O. (1996). Soil and water management systems (4th ed.). New York: John Wiley and Sons.
Παραπομπή Chicago StyleSchwab, Glenn Orville. Soil and Water Management Systems. 4th ed. New York: John Wiley and Sons, 1996.
Παραπομπή MLASchwab, Glenn Orville. Soil and Water Management Systems. 4th ed. New York: John Wiley and Sons, 1996.
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