There are no single sources. There are as many as there were incidents. I read space websites and space related news sites all the time.Originally Posted by Markus
For sources:
Google Proton failure
Google Briz-m failure
Those upper stages failed repeatedly and they never bothered to get to the reasons. After failing at a launch for ESA they were forced to to investigate more deeply and found a very damning fault in the production line. Hopefully their successrate will now get better. Instead of blaming US-radar like in their Phobos Grunt mission.
Google Sea Launch.
They are going out of business after several launch failures. The com sat providers no longer trust them and did not place orders.
Russian space organizations are in the middle of a major shakedown and reorganization. Heads are rolling as we speak. Fortunately at this time not literally though.