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by Perkinson, Robert R.
by Robert R. Perkinson; Arthur E. Jongsma
by Robert R. Perkinson
by Perkinson, Robert R.; Jongsma, Arthur E.; Bruce, Timothy J.
by Robert R. Perkinson (PhD, Canton, SD); Arthur E. Jongsma (PhD, Life Guidance Services, Grand Rapids, MI); Contributing Editor: Timothy J. Bruce (University of Illinois College of Medicine, Peoria, IL)
by Robert R. Perkinson (PhD, Canton, SD); Arthur E. Jongsma (PhD, Life Guidance Services, Grand Rapids, MI); Timothy J. Bruce (University of Illinois College of Medicine, Peoria, IL)