Cita APA (7a ed.)

Flegg, G. (1984). Numbers: Their history and meaning. Penguin.

Cita Chicago Style (17a ed.)

Flegg, Graham. Numbers: Their History and Meaning. Harmondsworth [etc.]: Penguin, 1984.

Cita MLA (9a ed.)

Flegg, Graham. Numbers: Their History and Meaning. Penguin, 1984.