Crick, Darren (31 March 2016). "RAAF A1 de Havilland D.H.9a". Australian & New Zealand Military Aircraft Serials & History. adf-serials.com.au. Archived from the original on 8 March 2020. Retrieved 16 May 2020.
Crick, Darren (31 March 2016). "RAAF A1 de Havilland D.H.9a". Australian & New Zealand Military Aircraft Serials & History. adf-serials.com.au. Archived from the original on 8 March 2020. Retrieved 16 May 2020.