Delta Air Lines System Timetable 1979 April 29 Amended
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1979 April 29 Amended." Delta Flight Museum. 1979-05-21, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19790429b.
APA
Delta Air Lines, Inc. (1979-05-21). Delta Air Lines System Timetable 1979 April 29 Amended. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19790429b
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1979 April 29 Amended." 1979-05-21. August 6, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19790429b.
