Delta Air Lines System Timetable 1947 April 1
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1947 April 1." Delta Flight Museum. 1947-04-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19470401.
APA
Delta Air Lines, Inc. (1947-04-01). Delta Air Lines System Timetable 1947 April 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19470401
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1947 April 1." 1947-04-01. May 8, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19470401.
