1. Ashmore, R. D. (1990). Sex, gender, and the individual. In L. A. Pervin (Ed.), Handbook of personality: Theory and research (pp. 486–526). New York: Guilford.
2. Baltes, P. B., Reese, H. W., & Nesselroade, J. (1988). Life-span developmental psychology: Introduction to research methods. Hillsdale, NJ: Erlbaum.
3. Baltes, P. B., & Smith, J. (1999). Multilevel and systemic analyses of old age: Theoretical and empirical evidence for a fourth age. In V. L. Bengtson & K. W. Schaie (Eds.), Handbook of theories of aging (pp. 153–173). New York: Springer.
4. Bem, S. L. (1974). The measurement of psychological androgyny. Journal of Consulting and Clinical Psychology, 42, 155–162.
5. Bem, S. L. (1979). Theory and measurement of androgyny: A reply to the Pedhauzer–Tetenbaum and Locksley–Colten critiques. Journal of Personality and Social Psychology, 37, 1047–1054.