$1!A>!AX!9&!4x!3m (B: s $1!0!!`D!0!!^M!=f!DJ!8:!G* (B/s - $1!R7!=j!Ros; Robertson, Roy; $1!R7!=j!Ros ($1!a)!H$ (B: s $1!GK!1W!CZ!3K!JH!Na(B,s, 1991)
Translation of: The Timothy principle / Roy Robertson ; Colorado Springs, Colo. : NavPress, c1986.
Keywords: Evangelistic work; Robertson, Roy; Spiritual life