Cita APA (7th ed.)

United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class T Technology. Gale Research.

Cita Chicago (17th ed.)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class T Technology. Detroit: Gale Research, 1990.

Cita MLA (9th ed.)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class T Technology. Gale Research, 1990.