APA (7th ed.) Citation

Macdonald, T., & Roberts, A. M. (2013). Horizon. BBC Worldwide.

Chicago Style (17th ed.) Citation

Macdonald, Toby, and Alice M. Roberts. Horizon. London, England: BBC Worldwide, 2013.

MLA (9th ed.) Citation

Macdonald, Toby, and Alice M. Roberts. Horizon. BBC Worldwide, 2013.