APA Zitierstil
USA Minerals Management Service, Mast, R. F., & Martin, P. E. (1989). Estimates of undiscovered conventional oil and gas resources in the United States. U.S. Geological Survey.
MLA ZitierstilUSA Minerals Management Service, Richard F. Mast, und P. E. Martin. Estimates of Undiscovered Conventional Oil and Gas Resources in the United States. U.S. Geological Survey, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.