GILLIAM, Kyle C.; BAKER, Matt; RAYFIELD, John; RITZ, Rudy; CUMMINS, R. Glenn. Effects of Question Difficulty and Post-Question Wait-Time on Cognitive Engagement: A Psychophysiological Analysis. Journal of Agricultural Education, [S. l.], v. 59, n. 4, p. 286–300, 2018. DOI: 10.5032/jae.2018.04286. Disponível em: https://jae-online.org/index.php/jae/article/view/1417. Acesso em: 19 may. 2026.