Sloley, R. W. (1942). Instruments: Repair, overhaul, testing, and calibration of aircraft and aero-engine instruments; adjustment, installation, and compensation of compasses in aircraft; category "X" licence (4th and rev. ed.). Pitman.
Chicago-referens (17:e uppl.)Sloley, Robert Walter. Instruments: Repair, Overhaul, Testing, and Calibration of Aircraft and Aero-engine Instruments; Adjustment, Installation, and Compensation of Compasses in Aircraft; Category "X" Licence. 4th and rev. ed. London,: Pitman, 1942.
MLA-referens (8:e uppl.)Sloley, Robert Walter. Instruments: Repair, Overhaul, Testing, and Calibration of Aircraft and Aero-engine Instruments; Adjustment, Installation, and Compensation of Compasses in Aircraft; Category "X" Licence. 4th and rev. ed. Pitman, 1942.