APA (7th ed.) Citation

Olson, N. B. (1974). The combined indexes to the Library of Congress classification schedules, 1974. U.S. Historical Documents Institute.

Chicago Style (17th ed.) Citation

Olson, Nancy B. The Combined Indexes to the Library of Congress Classification Schedules, 1974. Washington: U.S. Historical Documents Institute, 1974.

MLA (9th ed.) Citation

Olson, Nancy B. The Combined Indexes to the Library of Congress Classification Schedules, 1974. U.S. Historical Documents Institute, 1974.