1. Motivating Adult Learners to Learn at Adult-Education Schools in Saudi Arabia
2. Billings, E., & Walqui, A. (2017). Zone of Proximal Development: An Affirmative Perspective in Teaching ELLs. WestEd. https://scholar.google.com/scholar?hl=en&as_sdt=0%2C14&q=The+zone+of+proximal+development%3A+An+affirmative+perspective+in+teaching+ELLs&btnG
3. Electric vehicle deployment & fossil fuel tax revenue in Mexico to 2050
4. Brookfield, S. (1995). Adult Learning: An Overview. https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=0e6eec8d5d7efe3f9a5d0c1d3430d33fefcfa128