APA (7th ed.) Citation
Boice, J. M., & Ryken, P. G. (1999). The heart of the cross. Crossway Books.
Chicago Style (17th ed.) Citation
Boice, James Montgomery, and Philip Graham Ryken. The Heart of the Cross. Wheaton, Ill.: Crossway Books, 1999.
MLA (9th ed.) Citation
Boice, James Montgomery, and Philip Graham Ryken. The Heart of the Cross. Crossway Books, 1999.
Warning: These citations may not always be 100% accurate.