APA (7th ed.) Citation

McGrain, P. (1976). Tar sands (rock asphalt) of Kentucky: A review. Kentucky Geological Survey.

Chicago Style (17th ed.) Citation

McGrain, Preston. Tar Sands (rock Asphalt) of Kentucky: A Review. Lexington: Kentucky Geological Survey, 1976.

MLA (9th ed.) Citation

McGrain, Preston. Tar Sands (rock Asphalt) of Kentucky: A Review. Kentucky Geological Survey, 1976.

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