U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Runchock, R., & Droste, K. (1989). Class D. Subclasses DJK-DK. History of Eastern Europe (general), Soviet Union, Poland: Library of Congress classification schedules combined with additions and changes through 1988. Gale Research Inc.
Cita Chicago (17th ed.)U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Rita Runchock, i Kathleen Droste. Class D. Subclasses DJK-DK. History of Eastern Europe (general), Soviet Union, Poland: Library of Congress Classification Schedules Combined with Additions and Changes Through 1988. Detroit, Michigan: Gale Research Inc, 1989.
Cita MLA (9th ed.)U.S. Library of Congress. Subject Cataloging Division, et al. Class D. Subclasses DJK-DK. History of Eastern Europe (general), Soviet Union, Poland: Library of Congress Classification Schedules Combined with Additions and Changes Through 1988. Gale Research Inc, 1989.