APA (7th ed.) Citation

Não informado. (2001). Bulletin of the Pennsylvania Geological Survey. Pennsylvania Geological Survey.

Chicago Style (17th ed.) Citation

Não informado. Bulletin of the Pennsylvania Geological Survey. Harrisburg, Pa: Pennsylvania Geological Survey, 2001.

MLA (8th ed.) Citation

Não informado. Bulletin of the Pennsylvania Geological Survey. Pennsylvania Geological Survey, 2001.

Warning: These citations may not always be 100% accurate.