Cita APA (7a ed.)

Borchardt, W. G. (1939). A second course in arithmetic (3ª ed.). Rivingtons.

Cita Chicago Style (17a ed.)

Borchardt, W. G. A Second Course in Arithmetic. 3ª ed. London.: Rivingtons, 1939.

Cita MLA (9a ed.)

Borchardt, W. G. A Second Course in Arithmetic. 3ª ed. Rivingtons, 1939.