O’Neill, D. G.; Church, D. B.; McGreevy, P. D.; Thomson, P. C.; Brodbelt, D. C. Longevity and mortality of owned dogs in England. The Veterinary Journal. 2013, 198: 638–43. PMID 24206631. doi:10.1016/j.tvjl.2013.09.020.
O’Neill, D. G.; Church, D. B.; McGreevy, P. D.; Thomson, P. C.; Brodbelt, D. C. Longevity and mortality of owned dogs in England. The Veterinary Journal. 2013, 198: 638–43. PMID 24206631. doi:10.1016/j.tvjl.2013.09.020.