Delta Air Lines System Timetable 1981 October 25
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1981 October 25." Delta Flight Museum. 1981-10-25, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19811025.
APA
Delta Air Lines, Inc. (1981-10-25). Delta Air Lines System Timetable 1981 October 25. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19811025
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1981 October 25." 1981-10-25. August 4, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19811025.
