Kuuskraa Vello, Stevens Scott, Leeuwen Tyler Van, Moodhe Keith, & U.S. Energy Information Administration. World shale gas resources , an initial assessment of 14 regions outside the United States.
Chicago-referens (17:e uppl.)Kuuskraa Vello, Stevens Scott, Leeuwen Tyler Van, Moodhe Keith, och U.S. Energy Information Administration. World Shale Gas Resources , an Initial Assessment of 14 Regions Outside the United States.
MLA-referens (9:e uppl.)Kuuskraa Vello, et al. World Shale Gas Resources , an Initial Assessment of 14 Regions Outside the United States.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.