APA (7th ed.) Citation

Leonard, P., & Armstrong, A. (2005). Secrets of the sexes. BBC Worldwide.

Chicago Style (17th ed.) Citation

Leonard, Peter, and Alexander Armstrong. Secrets of the Sexes. London, England: BBC Worldwide, 2005.

MLA (9th ed.) Citation

Leonard, Peter, and Alexander Armstrong. Secrets of the Sexes. BBC Worldwide, 2005.

Warning: These citations may not always be 100% accurate.