1. Waters SR. The big picture. Travel Industry World Yearbook 1990; 34:151–153.
2. Hordinsky MH. Jr. Utilization of emergency kits by air carriers. FAA. Oklahoma City : Civil Aeromedical Institute, 1991.
3. Collins WE. Oral and written communication FAA, Oklahoma City : Civil Aeromedical Institute, 1993.
4. Wynne JB. Vacuum toilet evisceration (Letter). JAMA 1987; 257:1177.