Cita APA (7a ed.)

Norris, P. (1932). The principles and practice of commercial arithmetic (2nd ed.). Isaac Pitman & Sons.

Cita Chicago Style (17a ed.)

Norris, P.W. The Principles and Practice of Commercial Arithmetic. 2nd ed. London: Isaac Pitman & Sons, 1932.

Cita MLA (9a ed.)

Norris, P.W. The Principles and Practice of Commercial Arithmetic. 2nd ed. Isaac Pitman & Sons, 1932.