Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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