Polit D., Hungler B.: Nursing Research: Principles and Methods. Philadelphia, PA, Lippincott, 1987
2.
Woods N., Catanzaro M.: Nursing Research: Theory and Practice. St. Louis, MO, Mosby, 1988
3.
Labouvie EW: Longitudinal designs, in Bentler PM , Lettieri DJ (eds): Data Analysis Strategies and Designs for Substance Abuse Research. Rockville, MD , National Institute on Drug Abuse, 1976, pp 45-60
4.
Bailey BJ: Longitudinal designs: Application to nursing inquiry, in Gortner SR (ed): Nursing Science Methods: A Reader. San Francisco, CA, University of California, San Francisco Press, 1987, pp 121-126
5.
Miller D.: The Age Between: Adolescence and Therapy. New York, NY , Aronson, 1983
6.
Erikson EH: Childhood and Society. New York, NY, Norton, 1963
7.
Piaget J.: Play, Dreams and Imitation in Childhood. New York, NY, Norton, 1979
8.
Fine GA, Sandstrom KLKnowing Children: Participant Observation with Minors. Beverly Hills, CA, SAGE, 1988
