Delta Air Lines System Timetable 1961 June 20
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1961 June 20." Delta Flight Museum. 1961-06-20, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19610620.
APA
Delta Air Lines, Inc. (1961-06-20). Delta Air Lines System Timetable 1961 June 20. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19610620
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1961 June 20." 1961-06-20. April 30, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19610620.
