Unti, Bernard (1998). «Sewll, Anna». Στο: Bekoff, Marc. Encyclopedia of Animal Rights and Animal Welfare. Greenwood Press. σελ. 313. ISBN0-313-29977-3.
The Times on Black Beauty: "Fifty million copies of Black Beauty have been sold in the years since Anna Sewell's publisher paid her £20 for the story." (29 February 2008)