Delta Air Lines System Timetable 1970 February 1
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1970 February 1." Delta Flight Museum. 1970-02-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19700201.
APA
Delta Air Lines, Inc. (1970-02-01). Delta Air Lines System Timetable 1970 February 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19700201
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1970 February 1." 1970-02-01. April 30, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19700201.
