Andersen, Kristi. (2006). The Geometry of an Art: The History of the Mathematical Theory of Perspective from Alberti to Monge. New York: Springer‐Verlag. p.570
from: https://books.google.ch/books?id=8B_JeMxNUIkC&printsec=frontcover&hl=de&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
Camp, Pannill. (2014). The First Frame: Theatre Space Enlightenment France. Cambridge: Cambridge University Press. p.39/40
from: https://books.google.ch/books?id=EfpMBQAAQBAJ&pg=PA39&dq=john+lodge+cowley+references&hl=de&sa=X&ved=2ahUKEwiejv73-ZjuAhV3wAIHHX_eByYQ6AEwB3oECAkQAg#v=onepage&q=john%20lodge%20cowley%20references&f=false