Norlin, G., & Ellsworth, R. E. (1985). A voice from Colorado's past for the present: Selected writings of George Norlin. Colorado Associated University Press.
Chicago-referens (17:e uppl.)Norlin, George, och Ralph E. Ellsworth. A Voice from Colorado's Past for the Present: Selected Writings of George Norlin. Boulder, Colo.: Colorado Associated University Press, 1985.
MLA-referens (8:e uppl.)Norlin, George, och Ralph E. Ellsworth. A Voice from Colorado's Past for the Present: Selected Writings of George Norlin. Colorado Associated University Press, 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.