WALTON, W. C. (1970). Groundwater Resource Evaluation William C. Walton. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WALTON, William C. Groundwater Resource Evaluation William C. Walton. McGraw-Hill, 1970.
Lua MLA (8ú heag.)WALTON, William C. Groundwater Resource Evaluation William C. Walton. McGraw-Hill, 1970.
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