Here are a few references from an old bib of mine. Search on Amazon.com using the term Nursing Informatics and you will also find good texts. I'd also recomend the newest Interdisciplinary Informatics book - will update with full title and author(s) nnames when i can.
Carty, B. (Ed.), (2000), Nursing informatics: Education for practice (pp. 136-168). New York, NY: Springer.
Graves, J. R., & Corcoran, S. (1989). The study of nursing informatics. Image: The Journal of Nursing Scholarship, 21(4), pp. 227-231.
Hannah, K.J., Ball, M. J., & Edwards, M.J.A. (1994). Introduction to nursing informatics. NY: Springer-Verlag.
Saba, V.K. & McCormick, K.A. (1996). Essentials of computers for nurses (2nd ed.). NY: C.V. Mosby.
This is Susan K Newbold's nursing informatics webpage. Select the Newbold Publications link to find a lot of online articles and a list of reference books.
I have met and heard Susan lecture a couple of times. Bookmark her page to learn more about informatics.