1. American Society of Anesthesiologists Continuum of depth of sedation: definition of general anesthesia and levels of sedation/analgesia 2014 www.asahq.org/quality-and-practice-management/practice-guidance-resource-documents/continuum-of-depth-of-sedation-definition-of-general-anesthesia-and-levels-of-sedation-analgesia
2. Oxford Textbook of Anaesthesia
3. Fundamentals of Anaesthesia
4. Royal College of Anaesthetists Guidelines for the Provision of Anaesthetic Services 2016 London Royal College of Anaesthetists 2016 www.rcoa.ac.uk/document-store/guidance-the-provision-of-sedation-services-2016