Lihat Juga

• The Clinical Manifestations of a Doubtful Case
  oleh: Petty, M.
  Terbitan: (1917)
• A Case of Hydrophobia of Doubtful Origin
  oleh: Abbot, S. L., et al.
  Terbitan: (1881)
• The Means of Arriving at a Correct Diagnosis in Doubtful Cases of Glanders
  oleh: Nocard, M.
  Terbitan: (1888)
• Merchant of doubt
  oleh: Naomi Oreskes
  Terbitan: (2010)
• No Doubt About It : the case for Christianity
  oleh: Corduan, Winfried
  Terbitan: (1997)