| [1] | Do Thi Minh Lien (2002, 2006), Method to form primary number symbol for preschoolers, HNUE Publishing House, Hanoi. |
| |
| [2] | Do Thi Minh Lien (2011), Syllabus: Strategies to do math for early chilhood education, Vietnam Education Publishing House, Hanoi. |
| |
| [3] | Dinh Thi Nhung (2000), Mathematic and method to form number symbol for kindergarten. Volumm I,II- National University Publishing House, Hanoi. |
| |
| [4] | Dao Nhu Trang (1997), Children Guildance to begin number symbol in Math, National University Publishing House. |
| |
| [5] | J.Piaget - translated by Nguyen Xuan Khanh - Hoang Hung (2017), Formation of symbolic in children. Author Publishing. |
| |
| [6] | Janet Preis (2006), The Effect of Picture Communication Symbols on the Verbal Comprehension of Commands by Young Children With Autism, Focus on Autism and Other Developmental Disabilities, 21(4): 194-208. |
| |
| [7] | Kathleen Ann Quill (1995), Visually Cued Instruction for Children with Autism and Pervasive Developmental Disorders, Focus on Autism and Other Developmental Disabilities, 10(3): 10-20. |
| |
| [8] | Kathleen A. Quill (1997), Instructional Considerations for Young Children with Autism: The Rationale for Visually Cued Instruction, Journal of Autism and Developmental Disorders, 27: 697-714. |
| |
| [9] | Melissa E. Libertus, Lisa Feiqenson, Justin Halberda (2011), Preschool acuity of the approximate number system correlates with school math ability, Journal of Developmental science, 14(6): 1292-1300. |
| |
| [10] | Meijke E. Kolkman, Evelyn H. Kroesbergen, Paul P. M. Leseman (2013), Early numerical development and the role of non-symbolic and symbolic skills, Journal of Learning and Instruction, 25: 95-103. |
| |
| [11] | Virpi Vellonena, Eija Kärnäa, Marjo Virnesb. (2012), Communication of Children with Autism in a Technology-Enhanced Learning Environment, Procedia - Social and Behavioral Sciences, 69: 1208-1217. |
| |
| [12] | Su, Hui Fang Haung; Lai, Leanne; Rivera, Herminia Janet (2012), Effective mathematics strategies for pre-school children with autism, Journal of Australian Primary Mathematics Classroom, 17(2):25. |
| |
| [13] | Do Thi Thao, Nguyen Thi Hien (2019), Applying TEACCH program in developing and using some excercises for children with ASD to form number symbol, HNUE Journal of Science, Volumm 64(9): pg397-408. |
| |