Tönnsen, Kai-Christian. ”The Relevance of Trial-and-Error: Can Trial-and-Error Be a Sufficient Learning Method in Technical Problem-Solving-Contexts?”. Techne Serien - Forskning I slöjdpedagogik Och slöjdvetenskap, vol. 28, nr 2, april 2021, s. 303-12, https://journals.oslomet.no/index.php/techneA/article/view/4391.