APA-Zitierstil (7. Ausg.)

(1973). Geologic map of the south half of the Shamokin quadrangle, Northumberland and Columbia counties, Pennsylvania. U.S. Geological Survey.

Chicago-Zitierstil (17. Ausg.)

Geologic Map of the South Half of the Shamokin Quadrangle, Northumberland and Columbia Counties, Pennsylvania. Washington, D.C: U.S. Geological Survey, 1973.

MLA-Zitierstil (9. Ausg.)

Geologic Map of the South Half of the Shamokin Quadrangle, Northumberland and Columbia Counties, Pennsylvania. U.S. Geological Survey, 1973.