(Rafael Python 3). SouthAfrican Air Force. [20 March 2012]. (原始内容存档于2017-12-29). Python-5 brochure at Rafael's official site Derby brochure at Rafael's
(University of Cumbria) 德蒙福特大學(De Montfort University) 德比大學(University of Derby,Derby University) 杜伦大學(Durham University) 东英吉利亞大学(University of East Anglia