Geological Survey of Denmark and Greenland Bulletin | Geological Survey of Denmark and Greenland. Cambridge University Press.
Chicago-viite (17. p.)Geological Survey of Denmark and Greenland Bulletin | Geological Survey of Denmark and Greenland. Cambridge University Press.
MLA-viite (9. p.)Geological Survey of Denmark and Greenland Bulletin | Geological Survey of Denmark and Greenland. Cambridge University Press.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.