Rungjiratananon, W. ., Methinee Wongwanich Rumpagaporn, M. ., & Pitiporntapin, S. (2026). Development and Preliminary Evaluation of an Outdoor STEM-Based Extracurricular Activity Toolkit for Supporting Grade 6 Students’ Entrepreneurial Skills in Problem-Solving, Creative Thinking, and Collaboration. Science Essence Journal, 42(2), 289–305. https://doi.org/10.69523/sej.2026.42.17377