Cita APA (7a ed.)

University of Maryland, College Park. School of Library and Information Services, Wellisch, H. H., & Wilson, T. D. (1972). Subject retrieval in the seventies: New directions. Greenwood Pub. Co.

Cita Chicago Style (17a ed.)

University of Maryland, College Park. School of Library and Information Services, Hans H. Wellisch, y Thomas D. Wilson. Subject Retrieval in the Seventies: New Directions. Westport, Conn.: Greenwood Pub. Co, 1972.

Cita MLA (9a ed.)

University of Maryland, College Park. School of Library and Information Services, et al. Subject Retrieval in the Seventies: New Directions. Greenwood Pub. Co, 1972.