ebrary, Inc, & Polanka, S. (2011). No shelf required: E-books in libraries. American Library Association.
芝加哥风格引文ebrary, Inc, 与 Sue Polanka. No Shelf Required: E-books in Libraries. Chicago: American Library Association, 2011.
MLA引文ebrary, Inc, 与 Sue Polanka. No Shelf Required: E-books in Libraries. American Library Association, 2011.
警告：这些引文格式不一定是100％准确.