Roseler, K., Paul, C. A., Felton, M., & Theisen, C. (2018). Observable Features of Active Science Education Practices, 47(6), 83-91. Journal of College Science Teaching.
https://doi.org/10.2505/4/jcst18_047_06_83
https://doi.org/10.2505/4/jcst18_047_06_83