6Atzaba-Poria, N., & Pike, A. (2008). Correlates of parental differential treatment: Parental and contextual factors during middle childhood. Child Development, 79, 217-232.
7Baydar, N., Greek, A., & Brooks-Gunn, J. (1997). A longitudinal study of the effects of the birth of a sibling during the first 6 years of life. Journal of Marriage and the Family, 59, 939-956.
8Bowlby, J. (1969). Attachment and loss. Vol.I. Attachment. New York: Basic Books.
9Brody, G. H. (1998). Sibling relationship quality: Its causes and consequences. Annual Review of Psychology, 49, 1-24.
10Brody, G. H., Stoneman, Z., & Gauger, K. (1996). Parent-child relationships, family problem-solving behavior, and sibling relationship quality: The moderating role of sibling temperaments. Child Development, 67, 1289-1300.