R. V.  Chamberlin, ?On some genera and species of American millipeds?, Bulletin of the University of Utah, vol. 34, pp. 1?20, 1943.

C. Harvey Bollman, ?Notes on North American Julidæ?, Annals of the New York Academy of Sciences, vol. 4, no. 1-2, pp. 25?44, 1887.

R. V.  Chamberlin, ?New American Millipeds?, Bulletin of the University of Utah, vol. 31, 1941.