Graham, C. R., Borup, J., Short, C. R., & Archambault, L. (2019). K-12 Blended Teaching: A Guide to Personalized Learning and Online Integration (1st ed.), 1. BYU Open Learning Network. https://dx.doi.org/10.59668/2
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Access it online or download it at https://open.byu.edu/k12blended/index.