An introduction to Library of Congress subject headings /
Subject Cataloging Division, Processing Dept.
APA Citation
Library of Congress. Subject Cataloging Division. (1975). An introduction to Library of Congress subject headings. Washington: Library of Congress.
MLA Citation
Library of Congress. Subject Cataloging Division. An Introduction to Library of Congress Subject Headings. Washington: Library of Congress, 1975.
Warning: These citations may not always be complete (especially for serials).