APA (7th ed.) Citation

Tada, K., Tada, J. E., & Libby, L. (2013). Joni & Ken: An untold love story. Zondervan.

Chicago Style (17th ed.) Citation

Tada, Ken, Joni Eareckson Tada, and Larry Libby. Joni & Ken: An Untold Love Story. Grand Rapids, Mich.: Zondervan, 2013.

MLA (8th ed.) Citation

Tada, Ken, et al. Joni & Ken: An Untold Love Story. Zondervan, 2013.

Warning: These citations may not always be 100% accurate.