Dyfyniad APA

ebrary, Inc, & Polanka, S. (2011). The no shelf required guide to e-book purchasing. ALA TechSource.

Dyfyniad Arddull Chicago

ebrary, Inc, and Sue Polanka. The No Shelf Required Guide to E-book Purchasing. Chicago, Ill.: ALA TechSource, 2011.

Dyfyniad MLA

ebrary, Inc, and Sue Polanka. The No Shelf Required Guide to E-book Purchasing. ALA TechSource, 2011.

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