Gaya APA

Porterfield, G. (1972). Techniques of Water-Resources Investigations of the United States Geological Survey : Computation of Fluvial-Sediment Discharge . Washington: United States Government Printing Office.

Gaya MLA

Porterfield, George. "Techniques of Water-Resources Investigations of the United States Geological Survey : Computation of Fluvial-Sediment Discharge". Washington: United States Government Printing Office, 1972. Text.