Fifteen years of introductory programming in schools: A global overview of K-12 initiatives, Claudia Szabo, Judy Sheard, Andrew Luxton-Reilly, Linda Ott, et. al.
Michigan Tech Publications

A review of introductory programming research 2003–2017, Andrew Luxton-Reilly, Brett A. Becker, Linda Ott, Simon, Michail Giannakos, James Paterson, Ibrahim Albluwi, Amruth N. Kumar, Michael James Scott, Judy Sheard, Claudia Szabo
Michigan Tech Publications