Subject headings used in the dictionary catalogs of the Library of Congress :
cumulated supplement to the 4th edition January 1941-December 1944.

APA Citation

Library of Congress. Subject Cataloging Division. (1945). Subject headings used in the dictionary catalogs of the Library of Congress: cumulated supplement to the 4th edition January 1941-December 1944. New York: The H.W. Wilson Co. [by arrangement with the Library of Congress].

MLA Citation

Library of Congress. Subject Cataloging Division. Subject Headings Used In the Dictionary Catalogs of the Library of Congress: Cumulated Supplement to the 4th Edition January 1941-December 1944. New York: The H.W. Wilson Co. [by arrangement with the Library of Congress], 1945.