Observational learning as a function of symbolization and incentive set.

Bandura, A., Grusec, J. E., & Menlove, F. L. (1966). Observational learning as a function of symbolization and incentive set. Child Development, 37(3), 499–506. https://doi.org/10.1111/j.1467-8624.1966.tb04302.x