Northwest Orient Airlines Interim System Timetable 1982 June 1, 4th edition
MLA
Northwest Orient Airlines. "Northwest Orient Airlines Interim System Timetable 1982 June 1, 4th edition." Delta Flight Museum. 1982-06-01, https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19820601.
APA
Northwest Orient Airlines (1982-06-01). Northwest Orient Airlines Interim System Timetable 1982 June 1, 4th edition. Retrieved from https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19820601
Chicago
Northwest Orient Airlines. "Northwest Orient Airlines Interim System Timetable 1982 June 1, 4th edition." 1982-06-01. August 4, 2025. https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19820601.
