Northwest Airlines Schedule 1936 April 1
MLA
Northwest Airlines. "Northwest Airlines Schedule 1936 April 1." Delta Flight Museum. 1936-04-01, https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19360401.
APA
Northwest Airlines (1936-04-01). Northwest Airlines Schedule 1936 April 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19360401
Chicago
Northwest Airlines. "Northwest Airlines Schedule 1936 April 1." 1936-04-01. September 27, 2026. https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19360401.
