Steinmetz, G., 		Eich, L., 		Schroeder, G., 		Francisco, R., & 		Barbosa, J.
(2022).
 XPCodeHub: A gamified system model for learning programming through knowledge trails.
In <em>Proceedings of the 33rd Brazilian Symposium on Computers in Education</em>, (pp. 1367-1378). Porto Alegre: SBC.
doi:10.5753/sbie.2022.225084