J. P. Nolan & P. J. F. Baskett (1997). "Analgesia and anaesthesia". Dalam David Skinner, Andrew Swain, Rodney Peyton & Colin Robertson. Cambridge Textbook of Accident and Emergency Medicine. Project co-ordinator, Fiona Whinster. Cambridge, UK: Cambridge University Press. hlm. 194. ISBN9780521433792.Pemeliharaan CS1: Banyak nama: authors list (link)