APA   Click to copy
Gentner, D., & Namy, L. (1999). Comparison in the Development of Categories.

Chicago/Turabian   Click to copy
Gentner, D., and L. Namy. “Comparison in the Development of Categories” (1999).

MLA   Click to copy
Gentner, D., and L. Namy. Comparison in the Development of Categories. 1999.

@article{d1999a,
  title = {Comparison in the Development of Categories},
  year = {1999},
  author = {Gentner, D. and Namy, L.}
}