Delta Air Lines Worldwide Timetable December 1, 1999
MLA
Delta Air Lines, Inc.. "Delta Air Lines Worldwide Timetable December 1, 1999." Delta Flight Museum. 1999-12-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19991201.
APA
Delta Air Lines, Inc. (1999-12-01). Delta Air Lines Worldwide Timetable December 1, 1999. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19991201
Chicago
Delta Air Lines, Inc.. "Delta Air Lines Worldwide Timetable December 1, 1999." 1999-12-01. August 23, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19991201.
