Middeke, Annegret. “Circular Migration and Language Skills in German: A Multilingual Self-Learning Portfolio for Live-in Carers”. Journal for German and Scandinavian Studies Списание „Германистика и скандинавистика“, vol. 1, Dec. 2025, pp. 426-42, https://periodicals.uni-sofia.bg/index.php/gsc/article/view/3240.