Chen, C., S. Jeckel, G. Sonnert, and P. M. Sadler. ““Cowboy” and ‘Cowgirl’ Programming: The Effects of Precollege Programming Experiences on Success in College Computer Science”. International Journal of Computer Science Education in Schools, vol. 2, no. 4, Jan. 2019, pp. 22-40, doi:10.21585/ijcses.v2i4.34.