Dyfyniad APA

Stevens, N. D. (1961). A comparative study of three systems of information retrieval. Graduate School of Library Service, Rutgers, The State University.

Dyfyniad Arddull Chicago

Stevens, Norman D. A Comparative Study of Three Systems of Information Retrieval. New Brunswick, N.J.: Graduate School of Library Service, Rutgers, The State University, 1961.

Dyfyniad MLA

Stevens, Norman D. A Comparative Study of Three Systems of Information Retrieval. Graduate School of Library Service, Rutgers, The State University, 1961.

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