U. S. Library of Congress. Subject Cataloging Division, Gale Research Company, Library of Congress. Subject Cataloging Division, & Savage, H. (1973). Library of Congress Classification schedules, a cumulation of additions and changes, 1971-1972. Class C: Auxiliary sciences of history. Gale Research Company.
Citazione stile Chigago Style (17a edizione)U. S. Library of Congress. Subject Cataloging Division, Gale Research Company, Library of Congress. Subject Cataloging Division, e Helen Savage. Library of Congress Classification Schedules, a Cumulation of Additions and Changes, 1971-1972. Class C: Auxiliary Sciences of History. Detroit, Michigan: Gale Research Company, 1973.
Citatione MLA (9a ed.)U. S. Library of Congress. Subject Cataloging Division, et al. Library of Congress Classification Schedules, a Cumulation of Additions and Changes, 1971-1972. Class C: Auxiliary Sciences of History. Gale Research Company, 1973.