by Michael Ballam
by Advanced Training Institute International
by Don Staddon, Jr.
by Phil and Anne Garvin
by Otto Koning
by IBLP Publications
by Instituto de Principios Básicos
by Charles “Tremendous” Jones
by Phil Garvin
by Paul & Jenny Speed
by Chris & Anne Hogan
by David Barton
by Del Fehsenfeld
by Ray Comfort
by Roger Magnuson
by Stephen Olford