1. 2Vern L. Bullough, and Bonnie , The Emergence of Modern Nursing, Second Edition , New York: Macmillan, 1969 , pp. 1191 -1194 .
2. 3Facts About Nursing : New York: American Nurses' Association, 1969 , p. 10 , 16 .
3. 5Bullough, and Bullough , op. cit., pp. 182 -215 .