Delta Air Lines System Timetable 1938 March 15
MLA
Delta Air Corporation. "Delta Air Lines System Timetable 1938 March 15." Delta Flight Museum. 1938-03-15, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380315.
APA
Delta Air Corporation (1938-03-15). Delta Air Lines System Timetable 1938 March 15. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380315
Chicago
Delta Air Corporation. "Delta Air Lines System Timetable 1938 March 15." 1938-03-15. May 18, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380315.
