1. Don Michael TA, Lambert EH, Mehran A: Mouth to lung airway for cardiac resuscitation. Lancet 2: 1329, 1968
2. Gordon AS: Technique for cardiopulmonary resuscitation (CPR) and pitfalls in performance. In Meltzer LE, Dunning AJ (eds): Textbook of Coronary Care. Amsterdam, Excerpta Medica, 1973, pp 397–433
3. Gordon AS: Adjunctive equipment for cardio-pulmonary resuscitation. In Stephenson HE Jr (ed): Cardiac Arrest and Resuscitation, 4th ed. St. Louis, Mosby, 1974
4. American Heart Association: Standards for Cardiopulmonary Resuscitation (CPR) and Emergency Cardiac Care (ECC) JAMA (Suppl) 227 /7: 853, 1974
5. Schellinger RR: The length of the airway to the bifurcation of the trachea. Anesthesiology 25 /2: 169, 1964