This site does not host or receive funding from advertising or from display of commercial content. In most categories we do provide links to publishers’ or book sellers’ websites as a convenience for our users so they will have ready access to the full citation of texts listed. In addition we do indicate by use of a $ symbol when a resource is not freely available. This allows our users to know readily whether or not a link is freely available to them.
Published: 07 Jul 2015
Revised: 13 Oct 2015