• Brilowski G.A. & Wendler M. (2005) An evolutionary concept of caring. Journal of Advanced Nursing 50(6), 641650.
  • Rodgers B.L. (2000) Concept analysis: an evolutionary view. In Concept Development in Nursing: Foundations, Techniques and Applications, 2nd edn (RodgersB.L. & KnaflK., eds), Saunders, Philadelphia, PA, pp. 77102.
  • Sadler J. (1995) Analysis and Observation of the Concept of Caring in Nursing. PhD Thesis, The University of Wisconsin-Milwaukee, Milwaukee, WI, 272p. UMI order no. PUZ9528682.
  • Sadler J. (1997) Defining caring in professional nursing: a triangulated study. International Journal for Human Caring 1(3), 1221.
  • Sadler J. (2000) A multiphase approach to concept analysis and development. In Concept Development in Nursing, 2nd edn (RodgersB.L. & KnaflK.A., eds), Saunders, Philadelphia, PA, pp. 251283.