Mills, R. S., and Grusec, J. E. "Cognitive, Affective, and Behavioral Consequences of Praising  Altruism." MERRILL-PALMER QUARTERLY 35/3 (1989): 299-326. 

Investigates the effects of dispositional praise (attributing behavior to a positive trait), nondispositional praise, and no praise on the sharing and self-perceptions of 8- and 9-year-olds. Dispositional praise positively affected cognitive, affective and behavioral outcomes; other conditions did not. Girls were more generous than boys.  (COTTON)*