Cita APA (7a ed.)

Gill, W. J. C., & Colgate, H. A. (1971). 1815 to the present day (1. publ.). Arnold.

Cita Chicago Style (17a ed.)

Gill, W. J. C., y H. A. Colgate. 1815 to the Present Day. 1. publ. London: Arnold, 1971.

Cita MLA (9a ed.)

Gill, W. J. C., y H. A. Colgate. 1815 to the Present Day. 1. publ. Arnold, 1971.