APA (7th ed.) Citation

Hornsby, G., & Al-Khalili, J. (2012). Horizon. British Broadcasting Corporation (BBC).

Chicago Style (17th ed.) Citation

Hornsby, Gaby, and Jim Al-Khalili. Horizon. London, England: British Broadcasting Corporation (BBC), 2012.

MLA (9th ed.) Citation

Hornsby, Gaby, and Jim Al-Khalili. Horizon. British Broadcasting Corporation (BBC), 2012.