1. Cataraci, T., & Santucci, G. (1995). Are visual query languages easier to use than traditional ones? An experimental proof. In M. A. R. Kirby, A. Dix, & J. E. Finlay (Eds.), People and Computers X: Proceedings of HCI’95, Hudders-Field (Cambridge programme on human-computer interaction). Cambridge: Cambridge University Press.
2. Chao, P.-Y. (2016). Exploring students’ computational practice, design and performance of problem-solving through a visual programming environment. Computers & Education, 95, 202–215.
3. Cooper, S., Dann, W., & Pausch, R. (2000). Alice. A 3-D tool for introductory programming concepts. Journal of Computing Sciences in Colleges, 15(5), 107–116.
4. Hils, D. D. (1993). A visual programming language for visualization of scientific data. Urbana: University of Illinois at Urbana-Champaign.
5. Hubbard, M. (1990). Constructive solid geometry for triangulated polyhedra. Department of Computer Science, Brown University, Providence, Rhode Island 02912, CS-90-07.