Wong, J. T., & Tantengco, M. T. T. (2015). Virtual manipulative for developing number concept readiness among children with intellectual disabilities. College of Education, University of the Philippines Diliman.

Wong, Jeanette T., and Myra Trinidad Timtiman Tantengco. Virtual Manipulative for Developing Number Concept Readiness Among Children with Intellectual Disabilities. Quezon City: College of Education, University of the Philippines Diliman, 2015.

Wong, Jeanette T., and Myra Trinidad Timtiman Tantengco. Virtual Manipulative for Developing Number Concept Readiness Among Children with Intellectual Disabilities. College of Education, University of the Philippines Diliman, 2015.