Winsler, A.; Diaz, R. M.; Montero, I. (1997). “The role of private speech in the transition from collaborative to independent task performance in young children”. 《Early Childhood Research Quarterly》 12: 59–79. doi:10.1016/S0885-2006(97)90043-0.
White, C. S.; Manning, B. H. (1994). “The effects of verbal scaffolding instruction on young children's private speech and problem- solving capabilities”. 《Instructional Science》 22: 39–59. doi:10.1007/BF00889522.