APA (7th ed.) Citation

Penfold, R. A. (1983). Audio amplifier construction / by R.A. Penfold. Babani.

Chicago Style (17th ed.) Citation

Penfold, R. A. Audio Amplifier Construction / by R.A. Penfold. London: Babani, 1983.

MLA (9th ed.) Citation

Penfold, R. A. Audio Amplifier Construction / by R.A. Penfold. Babani, 1983.

Warning: These citations may not always be 100% accurate.