Delta Air Corporation annual report 1939
MLA
Delta Air Corporation. "Delta Air Corporation annual report 1939." Delta Flight Museum. 1939, https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1939.
APA
Delta Air Corporation (1939). Delta Air Corporation annual report 1939. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1939
Chicago
Delta Air Corporation. "Delta Air Corporation annual report 1939." 1939. August 3, 2025. https://dlg.galileo.usg.edu/do:delta_dal-ar_dal-ar-1939.
