'Black Beauty' was protest literature
http://www.telegraph.co.uk/culture/books/3614809/Black-Beauty-was-protest-literature.html
An article discussing the purpose of the book "Black Beauty" and the historical context during its publication.
How 'Black Beauty' Changed The Way We See Horses
http://www.npr.org/2012/11/02/163971063/how-black-beauty-changed-the-way-we-see-horses
An article which explores the societal change produced by the publication of Black Beauty.
Royal Society for the Prevention of Cruelty to Animals
Today’s continuation of the Royal Society for the Prevention of Cruelty to Animals, established in England a few decades before Black Beauty was published.
Cost of Maintaining a Horse in Regency London
http://janeaustensworld.wordpress.com/2009/06/18/cost-of-maintaining-a-horse-in-regency-london/
An article about the cost and method of maintain a horse in London during the time of Black Beauty. This helps to contextualize the story.