Burk, Graeme; Smith, Robert (6 March 2012). “Series 1”. Who Is the Doctor: The Unofficial Guide to Doctor Who-The New Series (1st ed.). ECW Press. pp. 35–39. ASIN1550229842. ISBN1-55022-984-2. OCLC905080310
Burk, Graeme; Smith, Robert (6 March 2012). “Series 1”. Who Is the Doctor: The Unofficial Guide to Doctor Who-The New Series (1st ed.). ECW Press. pp. 35–39. ASIN1550229842. ISBN1-55022-984-2. OCLC905080310