1. CNN News Channel USA: ‘Donald trump on recording: not me’ http://edition.cnn.com/2016/05/13/politics/donald-trump-recording-john-miller-barron-fake-press/ May 14 2016
2. High Court of Justiciary Edinburgh Scotland: ‘Her Majesty's Advocate v Thomas Sheridan and Gail Sheridan’ Decided 23 December2010
3. How flexible is the human voice? – a case study of mimicry;Eriksson A.;Proc. EUROSPEECH 97,1997