Kemmler, Rolf. “The First Portuguese Textbooks of the German Language, Based on the Method Gaspey-Otto-Sauer”. Revista da ABRALIN 20, no. 3 (dezembro 7, 2021): 411–429. Acessado abril 26, 2024. https://revista.abralin.org/index.php/abralin/article/view/1915.