found: Her Four ponies, 1958:title page (Judith Campbell)
found: Princess Anne and her horses, 1972:title page (Judith Campbell)
found: The writers directory 1994-96(Judith Campbell (Marion Staplyton Pares); also writes as Anthony Grant; British; born 1914; genres: animals/pets, biography; career: journalist, broadcaster; lists publications, including "The mutant" as Anthony Grant)
found: British Library online catalogue, viewed 8 Nov. 2022(old heading: Campbell, Judith, pseud. [i.e. Marion Stapylton Pares])
found: MyHeritage website, viewed 8 Nov. 2022(Marion Pares (born Stapylton); birth: 1914; death: 2004)
found: Jane Badger Books website, viewed 8 Nov. 2022:author bio (Judith Campbell (pseud of Marion Stapylton Pares) wrote on various equine subjects, including "Your own pony club" (keeping a pony on a shoestring), police horses, and showjumpers; she is probably best known for her works on the Royal Family)