Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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