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http://www.aspca.org/about-us/faq/pet-statistics
[2] Kass, P., Johnson, K. and Weng, H. (2013) Evaluation of Animal Control Measures on Pet Demographics in Santa Clara County, California, 1993-2006. Peer Journal, 1, e18.
http://dx.doi.org/10.7717/peerj.18
[3] Scarlett, J. and Johnston, N. (2012) Impact of a Subsidized Spay Neuter Clinic on Impoundments and Euthanasia in a Community Shelter and on Service and Complaint Calls to Animal Control. Journal of Applied Animal Welfare Science, 15, 53-69.
http://dx.doi.org/10.1080/10888705.2012.624902
[4] White, S.C., Jefferson, E. and Levy, J.K. (2010) Impact of Publicly Sponsored Neutering Programs on Animal Population Dynamics in Animal Shelters: The New Hampshire and Austin Experiences. Journal of Applied Animal Welfare Science, 13, 191-212.
http://dx.doi.org/10.1080/10888700903579903
[5] Frank, J. and Carlisle-Frank, P. (2007) Analysis of Programs to Reduce Overpopulation of Companion Animals: Do Adoption and Low-Cost Spay/Neuter Programs Merely Cause Substitution of Sources? Ecological Economics, 62, 740-746.
http://dx.doi.org/10.1016/j.ecolecon.2006.09.011
[6] Kortis, B. (2013) Why, How and Applying for PetSmart Charities Funding. Texas Unites for Animals Conference, Austin.
http://www.texasunites.com/handouts/2013/20_Targeted%20TNR_Kortis.pdf
[7] Esri (2012) Esri Community Analyst: Reports Reference Guide.