^ A Philosopher Lecturing on the Orrery (1764-1766), Revolutionary Players, image from Derby Museum and Art Gallery, Derby, accessed March 2011
↑ 1,0 1,1 A Philosopher Lecturing on the Orrery (1764—1766), Revolutionary Players, выява з Музей і мастацкая галерэя Дэрбі, Дэрбі, accessed March 2011