Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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