«A brief note on Ferdinand Verbiest». Curious Expeditions, 02-07-2007. Arxivat de l'original el 2008-04-03. [Consulta: 18 març 2008]. – Note that the vehicle pictured is the Brumm model, not a replica of Verbiest's design.
«A brief note on Ferdinand Verbiest». Curious Expeditions, 02-07-2007. Arxivat de l'original el 2008-04-03. [Consulta: 18 març 2008]. – Note that the vehicle pictured is the Brumm model, not a replica of Verbiest's design.