Classification. :
Class Q: science.
APA Citation
Library of Congress. Subject Cataloging Division., Library of Congress. Classification Division., Gale Research Company. (1973). Classification.: Class Q: science. 6th ed. Washington: Library of Congress; [for sale by the Card Division].
MLA Citation
Library of Congress. Subject Cataloging Division, Library of Congress. Classification Division, and Gale Research Company. Classification.: Class Q: Science. 6th ed. Washington: Library of Congress; [for sale by the Card Division], 1973.
Warning: These citations may not always be complete (especially for serials).