The Doulos Principle, by James Walker Garrett, is a 119 page book written to explain the true meaning of Doulos, "Slave" in a Christian life.
The Gospel Collection: The Gospel of Mark
The Witnesses Trilogy: God With Us
Share Their Voice: Hannelie's Story
The Gospel Collection: The Gospel of Luke
Share Their Voice: Salavat's Story
Share Their Voice: Shafia's Story