APA (7th ed.) Citation

Duncan, I., & Dugan, D. (1990). Horizon. British Broadcasting Corporation (BBC).

Chicago Style (17th ed.) Citation

Duncan, Ian, and David Dugan. Horizon. London, England: British Broadcasting Corporation (BBC), 1990.

MLA (9th ed.) Citation

Duncan, Ian, and David Dugan. Horizon. British Broadcasting Corporation (BBC), 1990.