American Society of Anesthesiologists (ASA)

Practice Guidelines for Management of the Difficult Airway.

An Updated Report by the American Society of Anesthesiology.

Anesthesiology 2003; 98:1269-77

PDF of the Guidelines

American Society of Anesthesiologists Task Force on Management of the Difficult  Airway. Practice Guidelines for Management of the Difficult Airway.  Anesthesiology 1993; 78:597-602