Cita APA

Pullan, J. M. (1970). The history of the abacus (2. edition.). London: Hutchinson of London.

Citación estilo Chicago

Pullan, J. M. The History of the Abacus. 2. edition. London: Hutchinson of London, 1970.

Cita MLA

Pullan, J. M. The History of the Abacus. 2. edition. London: Hutchinson of London, 1970.