1. Ferguson, Everett. 2009. Baptism in the Early Church: History, Theology, and Liturgy in the First Five Centuries. Grand Rapids: Eerdmans.
2. Foster, Richard J., and Gayle D. Beebe. 2009. Longing for God: Seven Paths of Christian Devotion. Downers Grove: InterVarsity Press.
3. Kyle, Erick J. 2014. Sacred Systems: Exploring Personal Transformation in the Western Christian Tradition. Eugene: Pickwick Publications.
4. Martens, Peter W. 2012. Origen and Scripture: The Contours of the Exegetical Life. Oxford: Oxford University Press.
5. Mayes, Andrew D. 2009. Spirituality in Ministerial Formation: The Dynamic of Prayer in Learning. Cardiff: University of Wales Press.