1. Ackermann, E. (2001). Piaget’s constructivism, Papert’s constructionism: What’s the difference? Constructivism: Uses and Perspectives in Education, 1–11. https://doi.org/10.1.1.132.4253
2. Barrella, E. M., & Watson, M. K. (2016). Comparing the outcomes of horizontal and vertical integration of sustainability content into engineering curricula using concept maps. In New developments in engineering education for sustainable development (pp. 1–13). Springer.
3. Bayer, L. (2014). You complete me: On building a vertically integrated digital humanities program at the University of Georgia. Against the Grain, 26(6), 12.
4. Corrie, L. (1995). Vertical integration: Teachers’ knowledge and teachers’ voice. Australasian Journal of Early Childhood, 20(3), 1–5.
5. Economic Awareness Council. (2020). Economic Awareness Council. Website. https://www.econcouncil.org/