O’Neill, D. G.; Church, D. B.; McGreevy, P. D.; Thomson, P. C.; Brodbelt, D. C. (2013). „Longevity and mortality of owned dogs in England”. The Veterinary Journal. 198: 638—43. PMID24206631. doi:10.1016/j.tvjl.2013.09.020.
O’Neill, D. G.; Church, D. B.; McGreevy, P. D.; Thomson, P. C.; Brodbelt, D. C. (2013). „Longevity and mortality of owned dogs in England”. The Veterinary Journal. 198: 638—43. PMID24206631. doi:10.1016/j.tvjl.2013.09.020.