Inspectorate of the causes of the accident(NA, ÚCL, karton 84, sg. 2/1972)] ((页面存档备份,存于互联网档案馆)) English summary: Analysis and conclusions((页面存档备份,存于互联网档案馆))
(原始内容存档于2011-07-21). Accident discription of Maddux Airlines (英语). Bryan R. Swopes. 19 May 1934–18 May 1935. [2023-05-20]. (原始内容存档于2023-06-09) (英语). Accident Description