Library of Congress. Subject Cataloging Division, Ellinger, W. B., & Fischer, J. (1969). Classification (Preliminary edition.). Library of Congress.

Library of Congress. Subject Cataloging Division, Werner B. Ellinger, and John Fischer. Classification. Preliminary edition. Washington: Library of Congress, 1969.

Library of Congress. Subject Cataloging Division, et al. Classification. Preliminary edition. Library of Congress, 1969.