Berk, L. E. (2009). Exploring Lifespan Development . USA: Pearson Education, Inc.
Bogin, B. (2001). The growth of humanity. New York: Wiley-Liss.
Haxell, A. (2010). Psychology and Lifespan Development: 555101 [Lecture notes]. Auckland, New Zealand: Auckland University of Technology, Department of Health Sciences.
Lansford, J.E., Criss, M.M., Pettit, G.S., K.A., & Bates, J.E. (2003). Friendship quality, peer group affiliation, and peer antisocial behavior as moderators of the link between negative parenting and adolescent externalizing behavior. Journal of Research on Adolescence, 13, 161-184. doi: 10.1111/1532-7795.1302002
Mpofu, C. (Ed.). (2010). Psychology and lifespan development: A text book for health professionals. Melbourne: Pearson Education
Mpofu, C. (2010). Psychology and Lifespan Development: 555101 [Lecture notes]. Auckland, New Zealand: Auckland University of Technology, Department of Health Sciences.
Scarr S. & McCartney K. (1983). How people make their own environments: A theory of genotype: Environmental effects. Child Development, 54, 424-435. Retrieved May 27, 2010 from http://www.jstor.org/pss/1129703
Riggio, H.R. (2000). Measuring attitudes towards adult sibling relationships: The lifespan sibling relationship scale. Journal of Social and Personal Relationships, 17, 707-728. doi: 10.1177/0265407500176001
Wentzel, K.R., Barry, C.M., & Caldwell, K.A. (2004). Friendships in middle school: influences on motivation and school adjustment. Journal of Educational Psychology, 96, 195-203. Retrieved May 25, 2010 from
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