==References==== Sources ==*Hamblyn, Richard, "The Invention of Clouds", London, Picador, 2001, ISBN 978-0-330-39195-5*Thornes, John.E., "John Constable's Skies", The University of Birmingham Press, 1999, ISBN 1-902459-02-4.
* Hamblyn, Richard, "The Invention of Clouds", London, Picador, 2001, ISBN 978-0-330-39195-5* Thornes, John.E., "John Constable’s Skies", The University of Birmingham Press, 1999, ISBN 1-902459-02-4.