Citations
1. Dept. of Labor, Occupational Safety and Health Administration (2014). Oil and Gas Well Drilling and Servicing eTool. Retrieved from: https://www.osha.gov/SLTC/oilgaswelldrilling/otherresources.html
2. American Petroleum Institute (2014). Guidance Document for the Development of a Safety and Environmental Management System for Onshore Oil and Natural Gas Production Operations and Associated Activities. Retrieved from:www.api.org/
3. Bureau of Land Management (2014). Public Lands: Interior. Retrieved from: www.blm.gov