Ryan, W. J. (1946). Water treatment and purification (2nd ed.). New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleRyan, William J. Water Treatment and Purification. 2nd ed. New York: McGraw-Hill Book Company, 1946.
Παραπομπή MLARyan, William J. Water Treatment and Purification. 2nd ed. New York: McGraw-Hill Book Company, 1946.
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