F.  Escobar, ?Diversity and composition of dung beetle (Scarabaeinae) assemblages in a heterogeneous Andean landscape?, Tropical Zoology, vol. 17, pp. 123-136, 2004.

E.  Pineda, Moreno, C., Escobar, F., and Halffter, G., ?Frog, Bat and Dung Beetle Diversity in the Cloud Forest and Coffee Agroecosystems of Veracruz, Mexico?, Conservation Biology, vol. 19, pp. 400-410, 2005.