ElectronixTutor: an intelligent tutoring system with multiple learning resources for electronics oleh Arthur C. Graesser, Xiangen Hu, Benjamin D. Nye, Kurt VanLehn, Rohit Kumar, Cristina Heffernan, Neil Heffernan, Beverly Woolf, Andrew M. Olney, Vasile Rus, Frank Andrasik, Philip Pavlik, Zhiqiang Cai, Jon Wetzel, Brent Morgan, Andrew J. Hampton, Anne M. Lippert, Lijia Wang, Qinyu Cheng, Joseph E. Vinson, Craig N. Kelly, Cadarrius McGlown, Charvi A. Majmudar, Bashir Morshed, Whitney Baer