APA   Click to copy
Campbell, T., Ngo, B., & Fogarty, J. (2008). Game design principles in everyday fitness applications. Conference on Computer Supported Cooperative Work, 249–252.

Chicago/Turabian   Click to copy
Campbell, Taj, Brian Ngo, and James Fogarty. “Game Design Principles in Everyday Fitness Applications.” Conference on Computer Supported Cooperative Work (October 7, 2008): 249–252.

MLA   Click to copy
Campbell, Taj, et al. “Game Design Principles in Everyday Fitness Applications.” Conference on Computer Supported Cooperative Work, Oct. 2008, pp. 249–52.

@article{taj2008a,
  title = {Game design principles in everyday fitness applications},
  year = {2008},
  month = oct,
  day = {7},
  journal = {Conference on Computer Supported Cooperative Work},
  pages = {249-252},
  author = {Campbell, Taj and Ngo, Brian and Fogarty, James},
  booktitle = {cscw},
  month_numeric = {10}
}