Dyfyniad APA

ebrary, Inc, & Polanka, S. (2011). No shelf required: E-books in libraries. American Library Association.

Dyfyniad Arddull Chicago

ebrary, Inc, and Sue Polanka. No Shelf Required: E-books in Libraries. Chicago: American Library Association, 2011.

Dyfyniad MLA

ebrary, Inc, and Sue Polanka. No Shelf Required: E-books in Libraries. American Library Association, 2011.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.