1. The Pet Animals Act, 1951*
2. N. Comben(1955 ) Dogs, Cats and People , p.125 . Thames and Hudson, London.
3. F. Hobday(1939 ) Fiftr Years a Veterinary Surgeon , p.223 . Hutchinson, London.
4. S. Rubinstein(1947 ) The Street Trader's Lot-London; 1951 (... as recorded by. Henry Mayhew) pp.93 and93 . Sylvan Press, London.