APA   Click to copy
Stadler, M., Becker, N., Gödker, M., Leutner, D., & Greiff, S. (2015). Complex problem solving and intelligence. A meta-analysis. Intelligence, 53, 92–101. https://doi.org/10.1016/j.intell.2015.09.005

Chicago/Turabian   Click to copy
Stadler, M., N. Becker, M. Gödker, D. Leutner, and S. Greiff. “Complex Problem Solving and Intelligence. A Meta-Analysis.” Intelligence 53 (2015): 92–101.

MLA   Click to copy
Stadler, M., et al. “Complex Problem Solving and Intelligence. A Meta-Analysis.” Intelligence, vol. 53, 2015, pp. 92–101, doi:10.1016/j.intell.2015.09.005.

@article{stadler2015a,
  title = {Complex problem solving and intelligence. A meta-analysis},
  year = {2015},
  journal = {Intelligence},
  pages = {92-101},
  volume = {53},
  doi = {10.1016/j.intell.2015.09.005},
  author = {Stadler, M. and Becker, N. and Gödker, M. and Leutner, D. and Greiff, S.}
}