Παραπομπή APA

Fettke, C. R. (1961). Well-sample descriptions in Northwestern Pennsylvania and adjacent states. Harrisburg: Department of Internal Affairs. Topographic and Geologic Survey.

Παραπομπή Chicago Style

Fettke, Charles R. Well-sample Descriptions in Northwestern Pennsylvania and Adjacent States. Harrisburg: Department of Internal Affairs. Topographic and Geologic Survey, 1961.

Παραπομπή MLA

Fettke, Charles R. Well-sample Descriptions in Northwestern Pennsylvania and Adjacent States. Harrisburg: Department of Internal Affairs. Topographic and Geologic Survey, 1961.

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