APA (7th ed.) Citation

Geological Survey (U.S.) & Balk, R. (1956). Geologic map of the Massachusetts portion of the Bernardston quadrangle, Massachusetts-Vermont: Bedrock geology. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Robert Balk. Geologic Map of the Massachusetts Portion of the Bernardston Quadrangle, Massachusetts-Vermont: Bedrock Geology. Reston, Va.: The Survey, 1956.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Robert Balk. Geologic Map of the Massachusetts Portion of the Bernardston Quadrangle, Massachusetts-Vermont: Bedrock Geology. The Survey, 1956.