SCHUMANN, Stephan; HESSKE, Stefan; EBERLE, Franz. Portfolio – An Instrument for Self-Regulated Learning in Geography at High Schools? Empirical Results of the Swiss Project APU. Journal of Geography Education, [S. l.], v. 38, n. 1, p. 41–56, 2010. DOI: 10.18452/25526. Disponível em: https://zgd-journal.de/index.php/zgd/article/view/157. Acesso em: 2 apr. 2026.