Operator's, organizational, direct support, and general support maintenance manual :
spectrum analyzers TS-723A/U, TS-723B/U, TS-723C/U, and TS-723D/U (NSN 6625-00-668-9418).
APA Citation
United States. Department of the Air Force., United States. Department of the Army. (1988). Operator's, organizational, direct support, and general support maintenance manual: spectrum analyzers TS-723A/U, TS-723B/U, TS-723C/U, and TS-723D/U (NSN 6625-00-668-9418). [Washington, DC]: Departments of the Army and the Air Force.
MLA Citation
United States. Department of the Air Force, and United States. Department of the Army. Operator's, Organizational, Direct Support, And General Support Maintenance Manual: Spectrum Analyzers TS-723A/U, TS-723B/U, TS-723C/U, And TS-723D/U (NSN 6625-00-668-9418). [Washington, DC]: Departments of the Army and the Air Force, 1988.
Warning: These citations may not always be complete (especially for serials).