1. Heather Ashton (2002). Delirium and Hallucinations. In Elaine Perry, Heather Ashton & Allan Young (eds.), Neurochemistry of Consciousness: Neurotransmitters in Mind. John Benjamins. 181-203.
  2. Elaine Perry, Heather Ashton & Allan Young (eds.) (2002). Neurochemistry of Consciousness: Neurotransmitters in Mind. Advances in Consciousness Research. John Benjamins.
  3. Elaine Perry, Heather Ashton & Andrew W. Young (eds.) (2002). Neurochemistry of Consciousness: Neurotransmitters in Mind. John Benjamins.