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. doi:10.1016/j.tvjl.2013.09.020. PMID24206631. "n=105 median=8.0 IQR=5.5–10.2"
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. doi:10.1016/j.tvjl.2013.09.020. PMID24206631. "n=105 median=8.0 IQR=5.5–10.2"