The teachers at White Hall Meditation, an Insight Meditation group in Virginia, have a series of transcribed talks on the teachings of the Buddha on their website, including a good talk on the second noble truth and how to work with the causes of suffering. You can find their article here: Second Noble Truth, the Cause of Dissatisfaction
Rick Hanson provides a good summary of the third noble truth of the Buddha, that we can realize the end of suffering by letting go of the causes of our distress and thus beginning to experience equanimity. You can find his article here: The Third Noble Truth – The Noble Truth of the end of suffering.