"Top 30 Programmes". Broadcasters' Audience Research Board. Retrieved 8 February 2014. (User must select "BBC1" in the Channel field and then select the appropriate year, month and week to retrieve the figure for each episode)
bbc.co.uk
Writer: Dana Fainaru; Director: Steve Brett; Producer: Dafydd Llewelyn (19 August 2017). "Episode 1". Casualty. BBC. BBC One.