1. Évolution et phylogénie des Coléoptères Passalidae (Scarabaeoidea)
2. A new species of Abronia (Squamata: Anguidae) from the southeastern highlands of Guatemala.;Campbell;Herpetologica,1999
3. Anguid lizards of the genus Abronia: revisionary notes on the species of Nuclear Central America and adjacent Mexico, descriptions of four additional species, with a phylogenetic hypothesis for the genus and an identification key.;Campbell;Bulletin of the American Museum of Natural History,1993
4. New salamanders (Caudata: Plethodontidae) from Guatemala, with miscellaneous notes on known species.;Campbell;Miscellaneous Publications of the Museum of Zoology, University of Michigan,2010
5. Ogyges Kaup, a flightless genus of Passalidae (Coleoptera) from Mesoamerica: nine new species, a key to identify species, and a novel character to support its monophyly