APA   Click to copy
Dey, A. K. (2001). Understanding and Using Context. Ubiquitous Computing, 5(1), 4–7.

Chicago/Turabian   Click to copy
Dey, Anind K. “Understanding and Using Context.” Ubiquitous Computing 5, no. 1 (December 1, 2001): 4–7.

MLA   Click to copy
Dey, Anind K. “Understanding and Using Context.” Ubiquitous Computing, vol. 5, no. 1, Dec. 2001, pp. 4–7.

@article{anind2001a,
  title = {Understanding and Using Context},
  year = {2001},
  month = dec,
  day = {1},
  issue = {1},
  journal = {Ubiquitous Computing},
  pages = {4-7},
  volume = {5},
  author = {Dey, Anind K.},
  booktitle = {ubicomp},
  month_numeric = {12}
}