Easy PC Troubleshooting (BP) By R. A. Penfold

Easy PC Web Site Construction by R. A. Penfold (Paperback, 2003)

Easy PC Upgrading (BP) By R. A. Penfold

How to Build Advanced Short Wave Receivers, Penfold, R. A., 1977 Paperback

Practical Electronic Model Railway Projects by R. A. Penfold (Paperback, 1996)

Easy PC Interfacing (BP) By R. A. Penfold

Single IC Projects by R.A. Penfold

Practical Electronic Model Railway Projects by R. A. Penfold