Get to Know the Bulldog", 'The American Kennel Club', Retrieved ngày 29 tháng 5 năm 2014
American Kennel Club 2013 Dog Registration Statistics Historical Comparisons & Notable Trends, The American Kennel Club, Retrieved ngày 29 tháng 5 năm 2014
Ewing, Susan (2006). Bulldogs for dummies. Indiana: Wiley Publishing. ISBN 978-0-7645-9979-8.
Jesse, George R. (1866). Researches into the history of the British Dog, from ancient laws, charters, and historical records: With original anecdotes, and illustrations of the nature and attributes of the dog, from the poets and prose writers of ancient, mediaeval, and modern times. With engravings designed and etched by the author. Rob. Hardwicke. p. 306.
Merret, Christopher (1666). Pinax Rerum Naturalium Britannicarum, continens Vegetabilia, Animalia, et Fossilia. p. 169.
Ellis, Edward Robb (2005). The Epic of New York City – A Narrative History. Basic Books, New York. ISBN 978-0-7867-1436-0
Oliff, D. B. (1988) The Mastiff and Bullmastiff Handbook, The Boswell Press ISBN 0-85115-485-9.
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. doi:10.1016/j.tvjl.2013.09.020.
Evans, K.; Adams, V. (2010). "Proportion of litters of purebred dogs born by caesarean section". The Journal of small animal practice 51 (2): 113–118. doi:10.1111/j.1748-5827.2009.00902.x. PMID 20136998.
Baker, Steve (2001). Picturing the Beast. University of Illinois Press. p. 52. ISBN 0-252-07030-5.
Janik, Kinga (ngày 6 tháng 7 năm 2007). "Bulldogs Best at Bolstering School Spirit?". Georgetown Journalism. Truy cập ngày 22 tháng 7 năm 2008.
