CrossRef

CrossRef is a not-for-profit membership association of publishers. Since its founding in 1999, CrossRef has provided reference linking services for over 45 million content items, including journal articles, conference proceedings, books, book chapters, reference entries, technical reports, standards, and data sets. CrossRef’s goal is to be a trusted collaborative organization with broad community connections; authoritative and innovative in support of a persistent, sustainable infrastructure for scholarly communication.

http://www.crossref.org