Cita APA (7a ed.)

Borchardt, W. G. (1922). Commercial arithmetic. Rivingtons.

Cita Chicago Style (17a ed.)

Borchardt, W. G. Commercial Arithmetic. London: Rivingtons, 1922.

Cita MLA (9a ed.)

Borchardt, W. G. Commercial Arithmetic. Rivingtons, 1922.