"The "Channel Type"". The Aeroplane. Vol. 19, no. 2 (1st Report of the Aero Show). London: Temple Press. 14 July 1920. pp. 140–142. Retrieved 11 September 2011.
"The "Channel Type"". The Aeroplane. Vol. 19, no. 2 (1st Report of the Aero Show). London: Temple Press. 14 July 1920. p. 138. Retrieved 11 September 2011.