The program used in this study was an adaptation of the Kirshner Program (1977) for the remediation of symbol reversals.
Heydorn, B. L. (1984). Visual-Motor Training Program and Symbol Reversal Errors. Reading Horizons: A Journal of Literacy and Language Arts, 24 (4). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol24/iss4/5