If you are looking for the research paper related to , it is titled "Textbook Gamification: Transforming Exercises into Playful Quests by using Webble Technology."
: They suggest a "Textbook Gamification" approach that applies game mechanics directly to existing exercises rather than creating separate games from scratch. Studio [21]. Das Deutschbuch
: The authors argue that many digital textbooks (like the Unterrichtsmanager version of Studio [21]) have limited interaction features, such as simple navigation or note-taking, and often lack immediate feedback for learners. If you are looking for the research paper
If you were actually looking for physical "paper" copies of the textbook or its supplementary materials, they are available through major booksellers: such as simple navigation or note-taking