RALPH MICHAEL GARBER, LAWRENCE VAN KIRK, "Conditional Inspection", Aero, Boeing, archived from the original on 2021-03-01, பார்க்கப்பட்ட நாள் 2021-10-01RALPH MICHAEL GARBER, LAWRENCE VAN KIRK, "Conditional Inspection", Aero, Boeing, no. 14, archived from the original on 2021-03-01, retrieved 2021-10-01
RALPH MICHAEL GARBER, LAWRENCE VAN KIRK, "Conditional Inspection", Aero, Boeing, archived from the original on 2021-03-01, பார்க்கப்பட்ட நாள் 2021-10-01RALPH MICHAEL GARBER, LAWRENCE VAN KIRK, "Conditional Inspection", Aero, Boeing, no. 14, archived from the original on 2021-03-01, retrieved 2021-10-01