Cita APA (7th ed.)

Penning, F. M. (1957). Electrical discharges in gases. Philips Technical Library.

Cita Chicago (17th ed.)

Penning, F. M. Electrical Discharges in Gases. La Haya: Philips Technical Library, 1957.

Cita MLA (9th ed.)

Penning, F. M. Electrical Discharges in Gases. Philips Technical Library, 1957.