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.
Cita Chicago Style (17a ed.)Fletcher, Robert H., Glenda Clay Bradshaw, Jon Axline, y Irvin Shope. Montana's Historical Highway Markers. Rev. and expanded [ed.], 4th ed. Helena, Mont.: Montana Historical Society Press, 2008.
Cita MLA (8a ed.)Fletcher, Robert H., et al. Montana's Historical Highway Markers. Rev. and expanded [ed.], 4th ed. Montana Historical Society Press, 2008.
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