APA   Click to copy
Stadler, M., Herborn, K., Mustafic, M., & Greiff, S. (2020). The assessment of collaborative problem solving in PISA 2015. An investigation of the validity of the PISA 2015 CPS tasks. Computers &Amp; Education, 157, 103964. https://doi.org/10.1016/j.compedu.2020.103964

Chicago/Turabian   Click to copy
Stadler, M., K. Herborn, M. Mustafic, and S. Greiff. “The Assessment of Collaborative Problem Solving in PISA 2015. An Investigation of the Validity of the PISA 2015 CPS Tasks.” Computers & Education 157 (2020): 103964.

MLA   Click to copy
Stadler, M., et al. “The Assessment of Collaborative Problem Solving in PISA 2015. An Investigation of the Validity of the PISA 2015 CPS Tasks.” Computers &Amp; Education, vol. 157, 2020, p. 103964, doi:10.1016/j.compedu.2020.103964.

@article{stadler2020a,
  title = {The assessment of collaborative problem solving in PISA 2015. An investigation of the validity of the PISA 2015 CPS tasks},
  year = {2020},
  journal = {Computers & Education},
  pages = {103964},
  volume = {157},
  doi = {10.1016/j.compedu.2020.103964},
  author = {Stadler, M. and Herborn, K. and Mustafic, M. and Greiff, S.}
}