@article{KuehbergerBramannWeissetal.2019,
  author    = {Christoph K{\"u}hberger and Christoph Bramann and Zarah Weiß and Detmar Meurers},
  title     = {Task complexity in history textbooks: A multidisciplinary case study on triangulation in history education research},
  journal   = {History education research journal},
  volume    = {16},
  number    = {1},
  pages     = {139 -- 157},
  doi       = {10.18546/HERJ.16.1.12},
  year      = {2019},
}