1. Search NCBI’s Bookshelf
OR
2. Link directly from a PubMed abstract
   • Display the abstract of a PubMed citation.
   • Click on the “Links” hyperlink located to the right of the journal data line and select “Books”.
   • The abstract will contain highlighted terms which are actually hyperlinks to NCBI’s Bookshelf.
   • Clicking on any blue term will take you to a list of books in which the phrase is found.
   • The book sections are listed in order of relevance.

It is the first "open access" journal published by the San Francisco-based Public Library of Science (PLoS), a non-profit organization of scientists and physicians. It employs a new model for scientific publishing in which research articles are freely available to read and use through the Internet. The costs of publication are recovered not from subscription fees -- which limit information access and use -- but from publication fees paid by authors out of their grant funds and from other sources.

PLoS is one of several initiatives that promote open access to scientific and medical literature. Although they still represent only a fraction of the published research literature, many open-access journals have been launched. BioMed Central is a commercial publisher of original research papers using an open-access model. The Directory of Open Access Journals identifies 540 peer-reviewed open-access journals in wide-ranging scholarly and scientific fields. There are also groups, such as the Open Society Institute and SPARC that are providing support and advocacy for open-access publishing.