1. Bilbrey, C., Vorhaus, E., Farran, D., & Shufelt, S. (2007). Teacher observation in preschool (2008 revision). Tools of the Mind adaptation (2010). https://my.vanderbilt.edu/toolsofthemindevaluation/files/2012/01/Manual-TOP-Tools-2011_October.243.pdf
2. Blatchford, P., Russell, A., & Webster, R. (2012). Reassessing the impact of teaching assistants: How research challenges practice and policy. Routledge. https://doi.org/10.4324/9780203151969
3. Blatchford, P., Bassett, P., Brown, P., Koutsoubou, M., Martin, C., Russell, A., Webster, R., & Rubie-Davies, C. M. (2009). Deployment and impact of support staff in schools: The impact of support staff in schools: Results from strand 2, wave 2. Retrieved from http://maximisingtas.co.uk/research/the-diss-project.php
4. Bodrova, E., & Leong, D. J. (2007). Tools of the Mind: The Vygotskian approach to early childhood education (2nd ed.). Prentice-Hall.
5. Chase, C. I., & Mueller, D. J. (1993). Teacher aides: What do they really do in instruction? ERS Spectrum, 11(2), 16–20.