- Dirk Riehle, editor, Proceedings of the 11th International Symposium on Open Collaboration, San Francisco, CA, USA, August 19-21, 2015. ACM, 2015.
- Dirk Riehle, editor, Companion to the Proceedings of the 11th International Symposium on Open Collaboration, OpenSym 2015, San Francisco, California, USA, August 19-21, 2015. ACM, 2015.