APA   Click to copy
Robinson, K. M., & Dubé, A. K. (2009). Children's understanding of addition and subtraction concepts. Journal of Experimental Child Psychology, 103(4), 532–545.

Chicago/Turabian   Click to copy
Robinson, K. M., and A.K. Dubé. “Children's Understanding of Addition and Subtraction Concepts.” Journal of Experimental Child Psychology 103, no. 4 (2009): 532–545.

MLA   Click to copy
Robinson, K. M., and A. K. Dubé. “Children's Understanding of Addition and Subtraction Concepts.” Journal of Experimental Child Psychology, vol. 103, no. 4, 2009, pp. 532–45.

@article{k2009a,
  title = {Children's understanding of addition and subtraction concepts},
  year = {2009},
  issue = {4},
  journal = {Journal of Experimental Child Psychology},
  pages = {532-545},
  volume = {103},
  author = {Robinson, K. M. and Dubé, A.K.}
}