1. 2018. State of Computer Science Education. https://csteachers.org/documents/en-us/c5585f4c-ea5f-43e1-848f-016edc1cce2e/1/ Accessed: 2020-05-10. 2018. State of Computer Science Education. https://csteachers.org/documents/en-us/c5585f4c-ea5f-43e1-848f-016edc1cce2e/1/ Accessed: 2020-05-10.
2. 2019. State of Computer Science Education. https://csteachers.org/documents/en-us/e43c7636-849d-460c-96df-fa52b987dcd8/1/ Accessed: 2020-05-10. 2019. State of Computer Science Education. https://csteachers.org/documents/en-us/e43c7636-849d-460c-96df-fa52b987dcd8/1/ Accessed: 2020-05-10.
3. A K-6 computational thinking curriculum framework: Implications for teacher knowledge;Angeli Charoula;Journal of Educational Technology & Society,2016