Library of Congress subject headings :
a guide to sub-division practice /
Subject Cataloging Division, Processing Services.

APA Citation

Library of Congress. Subject Cataloging Division. (1981). Library of Congress subject headings: a guide to sub-division practice. Washington: Library of Congress.

MLA Citation

Library of Congress. Subject Cataloging Division. Library of Congress Subject Headings: a Guide to Sub-division Practice. Washington: Library of Congress, 1981.

Warning: These citations may not always be complete (especially for serials).