1. What Life Should Mean to You;Adler,1958
2. Sibling position and definition of self;Bigner;J. soc. Psychol.,1971
3. Birth order and internal-external locus of control;Eswara;J. soc. Psychol.,1978
4. The Birth Order Factor;Forer,1977
5. Beyond the Pleasure Principle;Freud,1948