1. 1. US Department of Commerce Bureau of the Census: Projections of ihe Population of the United Slates: 1977 to 2050 Population Esiimates and Projections Series P-25 No 704.
2. 2. Thibodeau JP Heben F: A clinic for senior citizens. The Nurse Practitioner 1978 11.
3. 3. Hawkins JW: Description analysis and evaluation of a developmental model in Thibodeau JW: Analysis of Conceptual Models of Nursing. Monterey Calif Wadsworth 1982.
4. 4. Infante MS (ed); Crisis lheory: A framework for nursing practice. Reston Va: Reston Publishing. 1982.