APA   Click to copy
Fischer, A., Greiff, S., & Funke, J. (2012). The process of solving complex problems. Journal of Problem Solving, 4, 19–42. https://doi.org/10.7771/1932-6246.1118

Chicago/Turabian   Click to copy
Fischer, A., S. Greiff, and J. Funke. “The Process of Solving Complex Problems.” Journal of Problem Solving 4 (2012): 19–42.

MLA   Click to copy
Fischer, A., et al. “The Process of Solving Complex Problems.” Journal of Problem Solving, vol. 4, 2012, pp. 19–42, doi:10.7771/1932-6246.1118.

@article{fischer2012a,
  title = {The process of solving complex problems},
  year = {2012},
  journal = {Journal of Problem Solving},
  pages = {19-42},
  volume = {4},
  doi = {10.7771/1932-6246.1118},
  author = {Fischer, A. and Greiff, S. and Funke, J.}
}