1. A. F. Metherell, H. M. A. El-Sum and L. Lamore, Editors, Acoustical Holography, 1, Plenum Press, New York, 1969.
2. E. E. Aldridge, A. B. Clare and D. A. Shepherd, “Ultrasonic Holography”, Automated Inspection for Defects and Dimensions, SIRA Conference, Eastbourne, May 1969.
3. E. E. Aldridge, A. B. Clare and D. A. Shepherd, “Progress in Ultrasonic Holography at Harwell”, Joint Conference on Industrial Ultrasonics, I.E.R.E., Loughborough, September 1969.
4. E. E. Aldridge, A. B. Clare and D. A. Shepherd, “Exploring the Use of Ultrasonic Holography in Non-destructive Testing”, Ultrasonics for Industry, London, October 1969