Hänvisningar gällande denna post

APA-referens (7:e uppl.)
Estados Unidos Geological Survey. (1929). Map of the Eastern part of the northward extension of the sheridan coal field, rosebud and big horn counties, Montana. U. S. Geological Survey.
Chicago-referens (17:e uppl.)
Estados Unidos Geological Survey. Map of the Eastern Part of the Northward Extension of the Sheridan Coal Field, Rosebud and Big Horn Counties, Montana. U. S. Geological Survey, 1929.
MLA-referens (9:e uppl.)
Estados Unidos Geological Survey. Map of the Eastern Part of the Northward Extension of the Sheridan Coal Field, Rosebud and Big Horn Counties, Montana. U. S. Geological Survey, 1929.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.