Moyle, J. B., & Moyle, E. W. (2001). Northland wildflowers: The comprehensive guide to the Minnesota region (Rev. ed.). University of Minnesota Press.

Moyle, John B., and Evelyn W. Moyle. Northland Wildflowers: The Comprehensive Guide to the Minnesota Region. Rev. ed. Minneapolis: University of Minnesota Press, 2001.

Moyle, John B., and Evelyn W. Moyle. Northland Wildflowers: The Comprehensive Guide to the Minnesota Region. Rev. ed. University of Minnesota Press, 2001.