1. Meleis AI. Theoretical nursing: development and progress. Philadelphia, PA: Lippincott Williams & Wilkins; 1997.
2. Meleis A.I.M.P. (2011) Theoretical nursing: development and progress, 15th edn. Lippincott Williams & Wilkins, Philadelphia, PA.
3. Duffey M, Muhlenkamp AF. A framework for theory analysis. Nurs Outlook. 1974;22(9):570–4.
4. Ellis R. Characteristics of significant theories. Nurs Res. 1968;17(3):217–222.
5. Hardy ME. Theories: components, development, evaluation. Nurs Res. 1974;23(2):100–107.