Gollnick, James. 2005. Religion and Spirituality in the Life Cycle. Studies in Education & Spirituality Series, volume 9. New York: Peter Lang.

Husserl, Edmund. 1965. “Philosophy as Rigorous Science.” In Phenomenology and the Crisis of Philosophy, translated by Quentin Lauer. 71–148. New York: Harper & Row.

Jonas, Hans. 1966. The Phenomenon of Life: Toward a Philosophical Biology. Chicago: University of Chicago Press.

Lane, Belden C. 2006. “Writing in Spirituality as a Self-Implicating Act: Reflections on Authorial Disclosure and the Hiddenness of the Self.” In Exploring Christian Spirituality: Essays in Honor of Sandra M. Schneiders, edited by Bruce H. Lescher and Elizabeth Liebert. 53–69. Mahwah, NJ: Paulist.

Martinez, Gaspar. 2001. Confronting the Mystery of God: Political, Liberation, and Public Theologies. New York: Continuum.

McGinn, Bernard. 1991. The Foundations of Mysticism: Origins to the Fifth Century. The Presence of God: A History of Western Christian Mysticism Series, volume 1. New York: Crossroad.

———. 2005. “Spirituality Confronts Its Future.” Spiritus 5(1): 88–96. http://dx.doi.org/10.1353/scs.2005.0014

McGinn, Bernard and Patricia F. McGinn. 2003. Early Christian Mystics: The Divine Vision of the Spiritual Masters. New York: Crossroad.

Nation, Mark T., Anthony Siegrist and Davidp. Umbel. 2013. Bonhoeffer the Assassin? Challenging the Myth, Recovering His Call to Peacemaking. Grand Rapids, MI: Baker Academic.

Rahner, Karl. 1970. “Scripture and Tradition.” In Sacramentum Mundi: An Encyclopedia of Theology, edited by Karl Rahner. 54–57. New York: Herder & Herder.

———. 1978. Foundations of Christian Faith: An Introduction to the Idea of Christianity, translated by William V. Dych. New York: Crossroad.

Saliers, Don E. 1989. “Christian Spirituality in an Ecumenical Age.” In Christian Spirituality: Post-Reformation and Modern, edited by Louis Dupré, Don E. Saliers, and John Meyendorff. 520–44. World Spirituality: An Encyclopedic History of the Religious Quest Series, volume 18. New York: Crossroad.

Schneiders, Sandra M. 1986. “Theology and Spirituality: Strangers, Rivals, or Partners?” Horizons 13(2): 253–274. http://dx.doi.org/10.1017/S036096690003632X

———. 1989. “Spirituality in the Academy.” Theological Studies 50: 676–697. http://dx.doi.org/10.1177/004056398905000403

———. 2002. “Biblical Spirituality.” Interpretation 56(2): 133–142. http://dx.doi.org/10.1177/002096430005600202

———. 2003. “Religion vs. Spirituality: A Contemporary Conundrum.” Spiritus 3(2): 163–185. http://dx.doi.org/10.1353/scs.2003.0040

———. 2005. “Approaches to the Study of Christian Spirituality.” In The Blackwell Companion to Christian Spirituality, edited by Arthur Holden, 15–34. Malden, MA: Blackwell. http://dx.doi.org/10.1002/9780470996713.ch2

———. 2006. “The Discipline of Christian Spirituality and Catholic Theology.” In Exploring Christian Spirituality: Essays in Honor of Sandra M. Schneiders, edited by Bruce H. Lescher and Elizabeth Liebert. 196–212. Mahwah, NJ: Paulist.

———. 2010. “Spirituality and the God Question.” Spiritus 10(2): 243–250.

Sheldrake, Philip. 1992. Spirituality and History: Questions of Interpretation and Method. New York: Crossroad.

———. 1998. Spirituality and Theology: Christian Living and the Doctrine of God. Maryknoll, NY: Orbis.

———. 2002. “Interpreting Texts and Traditions.” Sewanee Theological Review 46(1): 48–68.

———. 2006. “Spirituality and Its Critical Methodology.” In Exploring Christian Spirituality: Essays in Honor of Sandra M. Schneiders, edited by Bruce H. Lescher and Elizabeth Liebert. 15–34. Mahwah, NJ: Paulist.

———. 2007. “Spirituality and the Integrity of Theology.” Spiritus 7(1): 93–98.

———. 2011. “Christian Spiritual Traditions: Reframing Boundaries, Theory and Method.” In Towards a Theory of Spirituality, edited by Elisabeth Hense and Frans Maas. Studies in Spirituality Series, Supplement 22. 29–42. Leuven: Peeters.

Waaijman, Kees. 2002. Spirituality: Forms, Foundations, Methods, translated by John Vriend. Studies in Spirituality Supplements Series, volume 8. Leuven: Peeters.

———. 2007. “Spirituality: A Multifaceted Phenomenon.” Studies in Spirituality 17: 1–113. http://dx.doi.org/10.2143/SIS.17.0.2024643