ebrary, Inc, & Polanka, S. (2011). The no shelf required guide to e-book purchasing. ALA TechSource.
芝加哥风格引文ebrary, Inc, 与 Sue Polanka. The No Shelf Required Guide to E-book Purchasing. Chicago, Ill.: ALA TechSource, 2011.
MLA引文ebrary, Inc, 与 Sue Polanka. The No Shelf Required Guide to E-book Purchasing. ALA TechSource, 2011.
警告：这些引文格式不一定是100％准确.