United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class D subclass DS history of Asia. Gale Research.
Chicago-referens (17:e uppl.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D Subclass DS History of Asia. Detroit: Gale Research, 1990.
MLA-referens (9:e uppl.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D Subclass DS History of Asia. Gale Research, 1990.
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