J. P. Nolan & P. J. F. Baskett (1997). "Analgesia and anaesthesia". David Skinner, Andrew Swain, Rodney Peyton & Colin Robertson (Ed.). Cambridge Textbook of Accident and Emergency Medicine. Project co-ordinator, Fiona Whinster. Cambridge, UK: Cambridge University Press. s. 194. ISBN9780521433792. 8 Eylül 2017 tarihinde kaynağından arşivlendi.KB1 bakım: Editörler parametresini kullanan (link)
J. P. Nolan & P. J. F. Baskett (1997). "Analgesia and anaesthesia". David Skinner, Andrew Swain, Rodney Peyton & Colin Robertson (Ed.). Cambridge Textbook of Accident and Emergency Medicine. Project co-ordinator, Fiona Whinster. Cambridge, UK: Cambridge University Press. s. 194. ISBN9780521433792. 8 Eylül 2017 tarihinde kaynağından arşivlendi.KB1 bakım: Editörler parametresini kullanan (link)
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