[1] Longcore, T. 2005. Personal communication with Travis Longcore, The Urban Wildlands Group, October 10, 2005.[2] Mattoni, R. 1990. The endangered El Segundo blue butterfly. Journal of Research on the Leptidoptera 29(4):277-304.
[2] U.S. Fish and Wildlife Service. 1998. El Segundo Blue (Euphilotes battoides allyni) Recovery Plan. Portland, OR.
[3] Mattoni, R., T. Longcore, C. Zonneveld and V. Novotny. 2001. Analysis of transect counts to monitor population size in endangered insects: the case of the El Segundo blue butterfly, Euphilotes battoides allyni. Journal of Insect Conservation 5:197-206.
[4] Sapphos Environmental, Inc. 2005. LAX Master Plan Final EIS, Appendix A-3c: Los Angeles/El Segundo Dunes Habitat Restoration Plan. Los Angeles World Airports, U.S. Department of Transportation, and Federal Aviation Administration.