1. Economic problems in anesthesia;Haines;Current Researches Anesthesia Analgesia,1927
2. The jubilee year of organized anesthesia;Betcher;Anesthesiology,1956
3. Minutes of Meeting of the New York Society of Anesthetists,1936
4. Minutes of the Meeting of the Representatives of the Committee on Fellowship,1937
5. Historical development of the American Society of Anesthesiologists Inc.;Betcher,1982