Delta Air Lines System Timetable 1938 December 7
MLA
Delta Air Corporation. "Delta Air Lines System Timetable 1938 December 7." Delta Flight Museum. 1938-12-07, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19381207.
APA
Delta Air Corporation (1938-12-07). Delta Air Lines System Timetable 1938 December 7. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19381207
Chicago
Delta Air Corporation. "Delta Air Lines System Timetable 1938 December 7." 1938-12-07. May 11, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19381207.
