Podges, J. M., P. K. Kommers, K. W. Winnips, and W. van J. van Joolingen. “Mixing Problem Based Learning And Conventional Teaching Methods In An Analog Electronics Course”. American Journal of Engineering Education (AJEE), vol. 5, no. 2, Nov. 2014, pp. 99-114, doi:10.19030/ajee.v5i2.8973.