Capaldi's Past Whoniverse Appearances Not Ignored, Doctor Who TV, 28 September 2014 Kistler (2013) Page 224 Lofficier (1992) Foreword "Take the Quiz: Who – or What – in the Whoniverse Are You?".
BBC America - Anglophenia.  ^ Capaldi’s Past Whoniverse Appearances Not Ignored, Doctor Who TV, Ngày 28 tháng 9 năm 2014  ^ Kistler (2013) Page 224 ^ Lofficier (1992) Foreword ^ “Take the Quiz: Who - or What - in the Whoniverse Are You?”.