Fletcher, R. H., Bradshaw, G. C., Axline, J., & Shope, I. (2008). Montana's historical highway markers (Rev. and expanded [ed.], 4th ed.). Montana Historical Society Press.
Chicago Style (17th ed.) CitationFletcher, Robert H., Glenda Clay Bradshaw, Jon Axline, and Irvin Shope. Montana's Historical Highway Markers. Rev. and expanded [ed.], 4th ed. Helena, Mont.: Montana Historical Society Press, 2008.
MLA (8th ed.) CitationFletcher, Robert H., et al. Montana's Historical Highway Markers. Rev. and expanded [ed.], 4th ed. Montana Historical Society Press, 2008.
Warning: These citations may not always be 100% accurate.