R.H. McPeak, P.K. Lago, G.A. Hanley.
The Scarabaeoid Beetles of San Diego County, California, Part II. Diagnosis of Families Lucanidae and Scarabaeidae (Subfamilies Aphodiinae and Scarabaeinae) with comments on Part I.
PROCEEDINGS of the San Diego Society of Natural History. Number 4431, May 2014. Pp. 1-39.