Cita APA (7a ed.)

Purves, G. D. (1968). 1789 - the present (1. publ.). Muller.

Cita Chicago Style (17a ed.)

Purves, G. D. 1789 - the Present. 1. publ. London: Muller, 1968.

Cita MLA (9a ed.)

Purves, G. D. 1789 - the Present. 1. publ. Muller, 1968.