Charles Dickens

An Old Medium

All the Year Round, N. 217, Vol. 9, London 20 june 1863, pp. 394-396.

Fulgence Marion e Alfred de Neuville

L'Optique

Libraire de L. Hachette et c., Paris 1867.

John Timbs

Curiosities of London: exhibiting the most rare and remarkable objects of interest in the metropolis

John Camden Hotten, London 1867 (I ed. 1855).