Theisen, J. (1971). Library of Congress classification schedules: A cumulation of additions and changes through 1970 (2nd ed.). Gale Research.
Citace podle Chicago (17th ed.)Theisen, Jean. Library of Congress Classification Schedules: A Cumulation of Additions and Changes Through 1970. 2nd ed. Detroit: Gale Research, 1971.
Citace podle MLA (9th ed.)Theisen, Jean. Library of Congress Classification Schedules: A Cumulation of Additions and Changes Through 1970. 2nd ed. Gale Research, 1971.
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