1. Anon, 2008. The Merck Veterinary Manual. Merck and Co. Inc., Whitehouse Station, New Jersey, USA. (last updated 2008).
2. Morphological differentiation and adaptation in the Galapagos finches;Bowman;University of California Publications in Zoology,1961
3. Causton, C.E., 2001. Dossier on Rodolia cardinalis Mulsant (Coccinellidae: Cocinellinae), a potential biological control agent for the cottony cushion scale, Icerya purchasi Maskell (Margarodidae). Technical report. Charles Darwin Foundation for the Galapagos Islands.
4. Causton, C.E., 2003. Ensuring compatibility of biological control of Icerya purchasi Maskell with conservation in Galápagos: development of a procedure to evaluate risk. In: Van Driesche, R.G. (Ed.), Proceedings of the 1st International Symposium for the Biological Control of Arthropods, Honolulu, Hawaii, January 14–18, 2002. United States Department of Agriculture Forest Service, FHTET-03-05, Morgantown, West Virginia, United States, pp. 448–457.
5. Feeding range studies of Rodolia cardinalis (Mulsant), candidate biological control agent of Icerya purchasi Maskell in the Galapagos Islands;Causton;Biological Control,2004