Fleming, J.M.; Creevy, K.E.; Promislow, D.E.L. (March 2011). „Mortality in North American Dogs from 1984 to 2004: An Investigation into Age-, Size-, and Breed-Related Causes of Death“. Journal of Veterinary Internal Medicine. 25 (2): 187–198. doi:10.1111/j.1939-1676.2011.0695.x. PMID21352376.თარგი:Open access
"The Letter", David Matthews, Jo Lee Magazine, Nov. 2002, p. 18" "This little dog was found by me in the Palace of Yuan-Ming-Yuan near Pekin on the 6th of October 1860. It is supposed to have belonged to either the Empress, or one of the ladies of the Imperial
Family. It is a most affectionate and intelligent little creature – it has always been accustomed to being treated as a pet and it was with the hope that it might be looked upon as such by Her Majesty and the Royal Family that I have brought it from China." John Hart Dunne, Captain, 99th Regt.
Fleming, J.M.; Creevy, K.E.; Promislow, D.E.L. (March 2011). „Mortality in North American Dogs from 1984 to 2004: An Investigation into Age-, Size-, and Breed-Related Causes of Death“. Journal of Veterinary Internal Medicine. 25 (2): 187–198. doi:10.1111/j.1939-1676.2011.0695.x. PMID21352376.თარგი:Open access