Kalland, E. S., Lewis, G. R., Edwards, J. J., Bruce L. Shelley, & Covell, R. R. (1970). A call to Christian character: Toward a recovery of Biblical piety. Zondervan Publishing House.

Kalland, Earl S., Gordon R. Lewis, Joseph J. Edwards, Bruce L. Shelley, and Ralph R. Covell. A Call to Christian Character: Toward a Recovery of Biblical Piety. Michigan: Zondervan Publishing House, 1970.

Kalland, Earl S., et al. A Call to Christian Character: Toward a Recovery of Biblical Piety. Zondervan Publishing House, 1970.