United States. Internal Revenue Service. (1999). Tax information security guidelines for federal, state, and local agencies: Safeguards for protecting federal tax returns and return information (Rev. 3-99.). Dept. of the Treasury, Internal Revenue Service.
Chicago Style (17th ed.) CitationUnited States. Internal Revenue Service. Tax Information Security Guidelines for Federal, State, and Local Agencies: Safeguards for Protecting Federal Tax Returns and Return Information. Rev. 3-99. [Washington, D.C.?]: Dept. of the Treasury, Internal Revenue Service, 1999.
MLA (9th ed.) CitationUnited States. Internal Revenue Service. Tax Information Security Guidelines for Federal, State, and Local Agencies: Safeguards for Protecting Federal Tax Returns and Return Information. Rev. 3-99. Dept. of the Treasury, Internal Revenue Service, 1999.