1. J. A. Allen, 1893 .On a collection of mammals from the San Pedro Martir region of Lower California, with notes on other species, particularly of the genus Sitomys., Bulletin of the American Museum of Natural History, 5 :181 –202 .
2. [W. O] Ayres, 1856 .[The ground mole.]., Proceedings of the California Academy of Natural Sciences, 1 :53 .
3. J. Bachman, 1842 .Observations on the genus Scalops, (shrew moles,) with descriptions of the species found in North America., Boston Journal of Natural History, 4 :26 –35 .
4. The Mammals and Life Zones of Oregon
5. O. Bangs, 1899 .Descriptions of some new mammals from western North America., Proceedings of the New England Zoological Club, 1 :65 –72 .