OTTO, Karl-Heinz; MÖNTER, Leif O.; HOF, Sandra; WIRTH, Joachim. Geographic Experiments in Empirical Research. Journal of Geography Education, [S. l.], v. 38, n. 3, p. 133–145, 2010. DOI: 10.18452/25534. Disponível em: https://zgd-journal.de/index.php/zgd/article/view/177. Acesso em: 2 apr. 2026.