F.  Silvestri, ?Contribo alla conscenza dei Machilidae dell' America settentrionale?, vol. 5, pp. 324 - 350, 1911.

H.  Sturm, ?Possibilities and problems of morphological taxonomy shown by North American representatives of the subgenus Pedetontus s. str. and Petridiobius canadensis (Archaeognatha, Machilidae, Petrobiinae)?, vol. 48, no. 1, pp. 3 - 21, 2001.