United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class D subclass DJK-DK History of Eastern Europe. (General), Soviet Union, Poland. Gale Research.
Chicago Style (17. basım) AtıfUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D Subclass DJK-DK History of Eastern Europe. (General), Soviet Union, Poland. Detroit: Gale Research, 1990.
MLA (9th ed.) AtıfUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D Subclass DJK-DK History of Eastern Europe. (General), Soviet Union, Poland. Gale Research, 1990.
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