8Cobb, S. Social support as a moderator of life stress, Psychosomatic Medicine, 1976,38,300- 314.
9Furman W, et al(1992). Age and sex differences in perceptions of networks of personal relationships. Child Development, 63,103- 115.
10Shulman S.Close friendships in early and middle adolescence:Typology and friendship reasoning. New Directions for Child Development,1993,60,55 - 71 .