Delta Air Lines System Timetable 1967 April 30
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1967 April 30." Delta Flight Museum. 1967-04-30, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19670430.
APA
Delta Air Lines, Inc. (1967-04-30). Delta Air Lines System Timetable 1967 April 30. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19670430
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1967 April 30." 1967-04-30. July 4, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19670430.
