Cita APA (7a ed.)

RIBERA, G. (1979). Machine calculation for business and personal use.--Ed.2. Holden-Day.

Cita Chicago Style (17a ed.)

RIBERA, Gil. Machine Calculation for Business and Personal Use.--Ed.2. London: Holden-Day, 1979.

Cita MLA (9a ed.)

RIBERA, Gil. Machine Calculation for Business and Personal Use.--Ed.2. Holden-Day, 1979.