ebrary, Inc, & Polanka, S. (2011). No shelf required: E-books in libraries. American Library Association.
Citace podle Chicago (17th ed.)ebrary, Inc, a Sue Polanka. No Shelf Required: E-books in Libraries. Chicago: American Library Association, 2011.
Citace podle MLA (9th ed.)ebrary, Inc, a Sue Polanka. No Shelf Required: E-books in Libraries. American Library Association, 2011.
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