Monge-Nájera, J., Hernández, F., González, M. I., Soley, J., Araya, J., & Zolla, S. (1998). Spatial distribution, territoriality and sound production by tropical cryptic butterflies (Hamadryas, Lepidoptera: Nymphalidae): implications for the ''industrial melanism" debate.

Monge-Nájera, Julián, Francisco Hernández, María Isabel González, Javier Soley, José Araya, et Stefano Zolla. Spatial Distribution, Territoriality and Sound Production By Tropical Cryptic Butterflies (Hamadryas, Lepidoptera: Nymphalidae): Implications for the ''industrial Melanism" Debate. 1998.

Monge-Nájera, Julián, et al. Spatial Distribution, Territoriality and Sound Production By Tropical Cryptic Butterflies (Hamadryas, Lepidoptera: Nymphalidae): Implications for the ''industrial Melanism" Debate. 1998.