United States. Office of Personnel Management. (1990). Disability retirement under the Civil Service Retirement System. U.S. Office of Personnel Management.
Chicago Style (17th ed.) CitationUnited States. Office of Personnel Management. Disability Retirement Under the Civil Service Retirement System. [Washington, D.C.?]: U.S. Office of Personnel Management, 1990.
MLA (9th ed.) CitationUnited States. Office of Personnel Management. Disability Retirement Under the Civil Service Retirement System. U.S. Office of Personnel Management, 1990.
Warning: These citations may not always be 100% accurate.