APA (7th ed.) Citation

Skalla, W., Anderle, S., & Skalla, D. (2014). The mystery of Nils: Learn Norwegian. Enjoy the story (1st edition.). Skapago KG.

Chicago Style (17th ed.) Citation

Skalla, Werner, Sonja Anderle, and Daniela Skalla. The Mystery of Nils: Learn Norwegian. Enjoy the Story. 1st edition. Furth im Wald, Germany: Skapago KG, 2014.

MLA (9th ed.) Citation

Skalla, Werner, et al. The Mystery of Nils: Learn Norwegian. Enjoy the Story. 1st edition. Skapago KG, 2014.