APA   Click to copy
Graesser, A., Greiff, S., Stadler, M., & Shubeck, K. (2020). Collaboration in the 21st Century. The theory, assessment, and teaching of collaborative problem solving. Special issue. Computers in Human Behavior. https://doi.org/10.1016/j.chb.2019.09.010

Chicago/Turabian   Click to copy
Graesser, A., S. Greiff, M. Stadler, and K. Shubeck. “Collaboration in the 21st Century. The Theory, Assessment, and Teaching of Collaborative Problem Solving. Special Issue.” Computers in Human Behavior (2020).

MLA   Click to copy
Graesser, A., et al. “Collaboration in the 21st Century. The Theory, Assessment, and Teaching of Collaborative Problem Solving. Special Issue.” Computers in Human Behavior, 2020, doi:10.1016/j.chb.2019.09.010.

@article{graesser2020a,
  title = {Collaboration in the 21st Century. The theory, assessment, and teaching of collaborative problem solving. Special issue},
  year = {2020},
  journal = {Computers in Human Behavior},
  doi = {10.1016/j.chb.2019.09.010},
  author = {Graesser, A. and Greiff, S. and Stadler, M. and Shubeck, K.}
}