APA   Click to copy
Gockley, R., Forlizzi, J., & Simmons, R. G. (2007). Natural person-following behavior for social robots. Human-Robot Interaction, 17–24.

Chicago/Turabian   Click to copy
Gockley, Rachel, Jodi Forlizzi, and Reid G. Simmons. “Natural Person-Following Behavior for Social Robots.” Human-Robot Interaction (February 9, 2007): 17–24.

MLA   Click to copy
Gockley, Rachel, et al. “Natural Person-Following Behavior for Social Robots.” Human-Robot Interaction, Feb. 2007, pp. 17–24.

@article{rachel2007a,
  title = {Natural person-following behavior for social robots},
  year = {2007},
  month = feb,
  day = {9},
  journal = {Human-Robot Interaction},
  pages = {17-24},
  author = {Gockley, Rachel and Forlizzi, Jodi and Simmons, Reid G.},
  booktitle = {hri},
  month_numeric = {2}
}