Cita APA (7a ed.)

Penfold, R. A. (1991). Preamplifier and filter circuits. Bernard Babani.

Cita Chicago Style (17a ed.)

Penfold, R. A. Preamplifier and Filter Circuits. London: Bernard Babani, 1991.

Cita MLA (8a ed.)

Penfold, R. A. Preamplifier and Filter Circuits. Bernard Babani, 1991.