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Laming, Tim; Hewson, Robert (2000). Airbus A320. Zenith Imprint. p. 23. ISBN0-7603-0902-7. Archived from the original on 27 May 2021. Retrieved 29 October 2020.
Sebdon, Gilbert (7 February 1990). "A321 victory for West Germany". Flight International. Archived from the original on 22 June 2012. Retrieved 24 February 2011.
Moxon; Julian (17 March 1993). "A321: Taking on the 757". Flight International. Archived from the original on 22 June 2012. Retrieved 25 February 2011.
"Airbus Aircraft Data File". Civil Jet Aircraft Design. Elsevier. July 1999. Archived from the original on 27 January 2017. Retrieved 17 November 2016.