Zheng, Yunjian, Anxin Xu, Qiuqin Zheng, și Chich-Jen Shieh. „The Practice of Project-Based Learning to Outdoor Ecological Education on the Promotion of Students’ Problem-Solving Capability”. Revista de Cercetare si Interventie Sociala 73 (iunie 15, 2021): 69–80. Data accesării noiembrie 6, 2026. https://www.rcis.ro/journal/article/view/2840-the-practice-of-project-based-learning-to-outdoor.