New Scrum guide @Scrumguide.org

Scrum is a framework for developing and sustaining complex products. This Guide contains the definition of Scrum. This definition consists of Scrum’s roles, events, artifacts, and the rules that bind them together. Ken Schwaber and Jeff Sutherland developed Scrum; the Scrum Guide is written and provided by them. Together, they stand behind the Scrum Guide.

New Scrum guide (July 2016 release) here:

http://www.scrumguides.org

Source: Home | Scrum Guides