Παραπομπή APA

(1961). Machine indexing: Progress and problems. [Washington]: Center for Technology and Administration.

Παραπομπή Chicago Style

Machine Indexing: Progress and Problems. [Washington]: Center for Technology and Administration, 1961.

Παραπομπή MLA

Machine Indexing: Progress and Problems. [Washington]: Center for Technology and Administration, 1961.

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