Cooper, R.M.: Laryngoscopy — its past and future. Canadian Journal of Anesthesia, 2004, nro 51, s. R6. Artikkelin verkkoversio. (Arkistoitu – Internet Archive)
Cooper, R.M.: Laryngoscopy — its past and future. Canadian Journal of Anesthesia, 2004, nro 51, s. R6. Artikkelin verkkoversio. (Arkistoitu – Internet Archive)