Anais
Deci, E.L., & Ryan, R.M. (1991). A motivational approach to self: Integration in
personality. In R. Dienstbier (Ed.), Nebraska Symposium on Motivation: Vol. 38.
Perspectives on motivation (pp. 237-288). Lincoln: University of Nebraska Press.
ou
Cynx, J., Williams, H., & Nottebohm, F. (1992). Hemispheric diffences in avian
song discrimation. Proceedings of the National Academy of Sciences, USA, 89,
1372-1375.