Gaya APA

Collins, G, R. (1992). You Can Make A Difference : 14 principles for influencing lives (Trawas) . Grand Rapids: Zondervan Publishing House.

Gaya MLA

Collins, Gary, R.. "You Can Make A Difference : 14 principles for influencing lives (Trawas)". Grand Rapids: Zondervan Publishing House, 1992. Text.