Gospel Writing and Canon
An interesting new book Francis Watson, Gospel Writing: A Canonical Perspective apparently deals with numerous issues including Gospel sources:

Table of Contents

• Part One: The Eclipse of the Fourfold Gospel
  • 1. Augustine’s Ambitious Legacy
  • 2. Dismantling the Canon: Lessing/Reimarus
• Part Two: Reframing Gospel Origins
  • 3. The Coincidences of Q
  • 4. Luke the Interpreter
  • 5. Thomas versus Q
  • 6. Interpreting a Johannine Source (Jn, GEger)
  • 7. Reinterpreting in Parallel (Jn, GTh, GPet)
• Part Three: The Canonical Construct
• 8. The East: Limiting Plurality
• 9. The West: Towards Consensus
• 10. Origen: Canonical Hermeneutics
• 11. Image, Symbol, Liturgy
• In lieu of a Conclusion: Seven Theses on Jesus and the Canonical Gospel

 It seems Watson accepts the Farrer-Goodacre 'no-Q' stance as Q “entails a radical reconstruction of Christian origins” (p118). But how a theory has been used by some scholars need not be confused with what the theory entails.