DONAHUE-MARTENS, Scott. Christian Grethlein, An Introduction to Practical Theology: History, Theory, and the Communication of the Gospel in the Present. Homiletic, [S.l.], v. 42, n. 2, jan. 2018. ISSN 2152-6923. Available at: <http://homiletic.net/index.php/homiletic/article/view/4482>. Date accessed: 16 aug. 2018. doi: https://doi.org/10.15695/hmltc.v42i2.4482.