4[1]McClleand D C. The achieving society. Princeton. NJ: Van Nostrand, 1961
5[2]Atkinson J & Bitch D. An introduction to motivation. New York: Van Nostrand, 1964
6[3]Horner M S. Sex differences in achievement motivation in competitve and non - competitive situations. Unpublished doctoral dissertation. University of Michigan, 1968
7[10]Shaffer D R. Developmental Psychology: Childhood and Adolescence (4th ed). New York: Brooks/Colc, And ITP,1996
