Cita APA (7a ed.)

Wellisch, H., & Wilson, T. D. (1972). Subject Retrieval in the Seventies; New Directions. Proceedings of an International Symposium Held at the Center of Adult Education, University of Maryland, College Park, May 14 to 15, 1971.

Cita Chicago Style (17a ed.)

Wellisch, Hans, y Thomas D. Wilson. Subject Retrieval in the Seventies; New Directions. Proceedings of an International Symposium Held at the Center of Adult Education, University of Maryland, College Park, May 14 to 15, 1971. 1972.

Cita MLA (9a ed.)

Wellisch, Hans, y Thomas D. Wilson. Subject Retrieval in the Seventies; New Directions. Proceedings of an International Symposium Held at the Center of Adult Education, University of Maryland, College Park, May 14 to 15, 1971. 1972.