Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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