Delta Air Lines System Timetable 1938 August 1
MLA
Delta Air Corporation. "Delta Air Lines System Timetable 1938 August 1." Delta Flight Museum. 1938-08-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380801.
APA
Delta Air Corporation (1938-08-01). Delta Air Lines System Timetable 1938 August 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380801
Chicago
Delta Air Corporation. "Delta Air Lines System Timetable 1938 August 1." 1938-08-01. May 17, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380801.
