The effect of practice retrieving source on children's discrimination of live and story events was examined. Three- to 4- and 5- to 6-year-old children (N = 93) saw an event performed live and heard about a similar event from a story. Prior to a source-monitoring test, they received either source-monitoring practice or control practice. Source practice enhanced the accuracy of both age groups' live and story source attributions. When the supportiveness of the control condition was enhanced in Experiment 2, no difference in the source monitoring of 5- to 6-year-olds in the source and control practice groups was found. Source practice continued to enhance the 3- to 4-year-olds' source monitoring. The implications of the findings for eyewitness interviews are discussed. (Contains 4 tables.)