Delta Air Lines annual report 1999
MLA
Delta Air Lines, Inc.. "Delta Air Lines annual report 1999." Delta Flight Museum. 1999-08, https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1999.
APA
Delta Air Lines, Inc. (1999-08). Delta Air Lines annual report 1999. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1999
Chicago
Delta Air Lines, Inc.. "Delta Air Lines annual report 1999." 1999-08. February 28, 2026. https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1999.
