Delta Air Lines System Timetable 1938 February 1
MLA
Delta Air Corporation. "Delta Air Lines System Timetable 1938 February 1." Delta Flight Museum. 1938-02-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380201.
APA
Delta Air Corporation (1938-02-01). Delta Air Lines System Timetable 1938 February 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380201
Chicago
Delta Air Corporation. "Delta Air Lines System Timetable 1938 February 1." 1938-02-01. May 8, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19380201.
