Citazione Stile APA (7a Edizione)

United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class D history : General and Old world. Gale Research.

Citazione stile Chigago Style (17a edizione)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D History : General and Old World. Detroit: Gale Research, 1990.

Citatione MLA (9a ed.)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class D History : General and Old World. Gale Research, 1990.