Ward, R. C., & Robinson, M. (1990). Principles of hydrology (3rd ed.). London: McGraw-Hill Book Company.
Παραπομπή Chicago StyleWard, R. C., and M. Robinson. Principles of Hydrology. 3rd ed. London: McGraw-Hill Book Company, 1990.
Παραπομπή MLAWard, R. C., and M. Robinson. Principles of Hydrology. 3rd ed. London: McGraw-Hill Book Company, 1990.
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