The card catalogs of the Library of Congress :
a brief description /
by Barbara Westby and William J. Sittig.
APA Citation
Westby, B. Marietta., Sittig, W. J., Library of Congress. (1983). The card catalogs of the Library of Congress: a brief description. Rev. Washington: Library of Congress.
MLA Citation
Westby, Barbara Marietta, William J Sittig, and Library of Congress. The Card Catalogs of the Library of Congress: a Brief Description. Rev. Washington: Library of Congress, 1983.
Warning: These citations may not always be complete (especially for serials).