Delta Air Lines System Timetable 1968 October 1
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1968 October 1." Delta Flight Museum. 1968-10-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19681001.
APA
Delta Air Lines, Inc. (1968-10-01). Delta Air Lines System Timetable 1968 October 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19681001
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1968 October 1." 1968-10-01. May 1, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19681001.
