APA (7th ed.) Citation

Harrison, G., & Whitehall, J. (2018). Horizon: A user's guide. BBC Worldwide.

Chicago Style (17th ed.) Citation

Harrison, Giles, and Jack Whitehall. Horizon: A User's Guide. London, England: BBC Worldwide, 2018.

MLA (9th ed.) Citation

Harrison, Giles, and Jack Whitehall. Horizon: A User's Guide. BBC Worldwide, 2018.