Cita APA (7a ed.)

LIBRARY OF CONGRESS. Classification Division. (1913). Classification. Class Q: Science. Government Printing office.

Cita Chicago Style (17a ed.)

LIBRARY OF CONGRESS. Classification Division. Classification. Class Q: Science. Washington: Government Printing office, 1913.

Cita MLA (9a ed.)

LIBRARY OF CONGRESS. Classification Division. Classification. Class Q: Science. Government Printing office, 1913.