"Refighting old battles", The Economist (10–16 January 2015), 414(8290):23–4 Newsnight, BBC2, 5 January 2015 "The great fracturing", The Economist (21–7 February 2015), 414(8296):11 "Review of Ofcom list of major political parties for elections taking place on 7 May 2015" (PDF).
2015년 3월 7일에 확인함 – 가디언 경유.  "Refighting old battles", The Economist (2015년 1월 10일 ~ 16일), 414(8290):23–4 Newsnight, BBC2, 5 January 2015 "The great fracturing", The Economist (2015년 2월 21일 ~ 7일), 414(8296):11 “Review of Ofcom list of major political parties for elections taking place on 7 May 2015” (PDF).