1. Natural bitumen and extra-heavy oil;Attanasi,2007
2. Tar Sand Resources of the Uinta Basin, Utah. Open-File Report 335;Blackett,1996
3. Some sedimentary features of the Athabasca oil sands;Carrigy;Sediment. Geol.,1967
4. California Oil and Gas Fields, Volumes I, II and III,1998
5. Surface tar-sand deposits in California: Section;De Chadenedes,1987