1. “An examination of professional certification,”;Galbraith;Lifelong Learning,1985
2. “Certification for specialty practice?”;Beecroft;Clinical Nurse Specialist,1989
3. Perioperative Nursing, Inc, 1991 Certification and Recertification Guide;National Certification Board,1991
4. “Is certification necessary for specialty practice?”;Sullivan;Focus on Critical Care,1983
5. “56 ways to get certified,”;Fickeissen;American Journal of Nursing,1990