APA (7th ed.) Citation

Porter, B. (2016). British imperial: What the Empire wasn't. I.B. Tauris.

Chicago Style (17th ed.) Citation

Porter, Bernard. British Imperial: What the Empire Wasn't. London ; New York: I.B. Tauris, 2016.

MLA (9th ed.) Citation

Porter, Bernard. British Imperial: What the Empire Wasn't. I.B. Tauris, 2016.