United States. Library of Congress. (1988). Library of Congress classification schedules combined with additions and changes through 1987 Class Z: Bibliography and Library Science. Gale.
Citace podle Chicago (17th ed.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1987 Class Z: Bibliography and Library Science. Detroit: Gale, 1988.
Citace podle MLA (9th ed.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1987 Class Z: Bibliography and Library Science. Gale, 1988.
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