Nicol DJ, Boyle JT. Peer instruction versus class-wide discussion in large classes:
A comparison of two interaction methods in the wired classroom. Studies in Higher Education. 2003; 28:457-473. http://www.ph.utexas.edu/~ctalk/bulletin/glasgow1.pdf
Preszler RW, Dawe A, Shuster CB, Shuster M. Assessment of the effects of student response
systems on student learning and attitudes over a broad range of biology courses. Life Sciences Education. 2007;6:29-41. https://www.lifescied.org/doi/pdf/10.1187/cbe.06-09-0190