Ehlers, V. M., & Steel, E. W. (1958). Municipal and rural sanitation (5th ed.). New York London: McGraw-Hill Book Company.
Παραπομπή Chicago StyleEhlers, Victor Marcus, and Ernest William Steel. Municipal and Rural Sanitation. 5th ed. New York London: McGraw-Hill Book Company, 1958.
Παραπομπή MLAEhlers, Victor Marcus, and Ernest William Steel. Municipal and Rural Sanitation. 5th ed. New York London: McGraw-Hill Book Company, 1958.
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