Não informado. The Mountain Geologist. Rocky Mountain Association of Geologists.
Chicago-viite (17. p.)Não informado. The Mountain Geologist. Denver, Colo: Rocky Mountain Association of Geologists.
MLA-viite (8. p.)Não informado. The Mountain Geologist. Rocky Mountain Association of Geologists.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.