The Effect of Physical Environment and Crowded Classes on Academic Achievement. Journal Of Educational and Psychological Researches, [S. l.], v. 18, n. 68, p. 549–568, 2022. Disponível em: https://www.jperc.uobaghdad.edu.iq/index.php/jperc/article/view/1140. Acesso em: 5 jul. 2025.