"The Power of Patience" by Jennifer L. Roberts in Harvard Magazine. An accessible and thoughtful piece about the pedagogical value of patience, from the perspective of an art history professor.
Vaclav Havel, "Planting, Watering, Waiting" - in The New York Times, an adapted text from a moving speech given by Havel in 1992 on the importance of patience in politics.
Sarah A. Schnitker is a psychology professor at Fuller Theological Seminary who has done some promising research on patience (both its empirical status as a distinctive virtue and on the potential for improving patience). See her list of publications.
Healing Anger: The Power of Patience from a Buddhist Perspective by The Dalai Lama - Drawn from a series of talks in which the Dalai Lama (mainly) works through the key ideas about anger and patience in Shantideva's chapter on patience in the Guide to the Bodhisattva's Way of Life.
Waiting for God by Simone Weil - Weil's writings, especially concerning the link between attention and patience, have been important to my work. You can also find an online copy of Weil's "Reflections on the Right Use of School Studies With a View to the Love of God".
Patience: How We Wait Upon the World by David Baily Harned (new edition with an afterword by David Hein) - Baily's book was one of the few I found on patience. His focus is from within the Christian theological tradition, and there's a lot to learn and think about in it even for those who aren't interested in Christian ethics per se.
Anger and Forgiveness: Resentment, Generosity, Justice by Martha Nussbaum - to be released April 2016, this promises to be an exciting new book by Nussbaum. Her new (and improved!) views about anger, as I discuss them in On Patience, can be found here, as well as in her article "Transitional Anger."
MORE LINKS COMING SOON!