Cita APA (7th ed.)

Herdman, M. M. (1947). Classification: An introductory manual (2nd edition.). American Library Association.

Cita Chicago (17th ed.)

Herdman, Margaret May. Classification: An Introductory Manual. 2nd edition. Chicago: American Library Association, 1947.

Cita MLA (9th ed.)

Herdman, Margaret May. Classification: An Introductory Manual. 2nd edition. American Library Association, 1947.