Orrock studied painting under James Ferguson, William L. Leitch, and John Burgess, later enrolling at the Nottingham School of Design where he was taught by Thomas Stuart Smith.
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George Boolos, John Burgess, Richard Jeffrey (2002), Computability and Logic: Fourth Edition, Cambridge University Press, Cambridge, UK.
George Boolos, John Burgess, and Richard Jeffrey, 2002, Computability and Logic: Fourth Edition, Cambridge University Press, Cambridge UK, ISBN 0-521-00758-5 paperback.