Providing the most accurate and up to date information about BPMN 2.0 - BPMN.org is your official BPMN resource for Business Process Model and Notation.

Current BPMN Specification. BPMN v2.0; BPMN 2.0 by Example: non-normative OMG document with BPMN 2.0 examples; BPMN Quick Guide