APA (7th ed.) Citation

(1990). An explanation of the Superintendent of Documents classification system (Revised 1990.). Depository Administration Branch, Library Division, Library Programs Service, U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

An Explanation of the Superintendent of Documents Classification System. Revised 1990. Washington, DC: Depository Administration Branch, Library Division, Library Programs Service, U.S. Government Printing Office, 1990.

MLA (9th ed.) Citation

An Explanation of the Superintendent of Documents Classification System. Revised 1990. Depository Administration Branch, Library Division, Library Programs Service, U.S. Government Printing Office, 1990.