1. Concept development in nursing: foundations, techniques, and applications;Creason NS,1993
2. Theoretical nursing: development and progress;Meleis A,1985
3. Invitational Conference on Research Methods for Validating Nursing Diagnoses; 1989; Palm Springs;Gordon M,1989
4. Concept development in nursing: foundations, techniques, and applications;Rodgers BL,2000
5. Strategies for theory construction in nursing;Walker LO,1995