APA Style

Keller, T. et al (2015). The Meaning of Marriage Study Guide : A Vision for Married and Single People (cet. 1). Grand Rapids, MI: Zondervan.

MLA Style

Keller, Timothy. et al. "The Meaning of Marriage Study Guide : A Vision for Married and Single People". cet. 1 Grand Rapids, MI: Zondervan, 2015. Text.