Chinn, P.L., & Kramer, M.K. ( 2004). Integrated theory and knowledge development in nursing (7th ed.). St. Louis, MO: C. V. Mosby Co.
2.
Giordano, J., & Engebretson, C. (2006). Neural and cognitive basis of spiritual experience: Biopsychosocial and ethical implications for clinical medicine. Explore, 2(3), 216-225.
3.
Rodgers, B.L., & Knafl, K. ( 2000). Concept development in nursing. Foundations, techniques and applications (2nd ed.). Philadelphia: W.B. Saunders Co.
4.
Walker, L.O. & Avant, D.C. ( 2005). Strategies for theory construction in nursing (4th ed.). Upper Saddle River, NJ: Pearson/Prentice Hall.