United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class Q Science. Gale Research.
Style de citation Chicago (17e éd.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class Q Science. Detroit: Gale Research, 1990.
Style de citation MLA (9e éd.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class Q Science. Gale Research, 1990.
Attention : ces citations peuvent ne pas être correctes à 100%.