Cita APA (7a ed.)

Keen, E. M. (1976). A Retrieval Comparison of Six Published Indexes in the Field of Library and Information Science.

Cita Chicago Style (17a ed.)

Keen, E. Michael. A Retrieval Comparison of Six Published Indexes in the Field of Library and Information Science. 1976.

Cita MLA (9a ed.)

Keen, E. Michael. A Retrieval Comparison of Six Published Indexes in the Field of Library and Information Science. 1976.