APA   Click to copy
Harris, R. A. (1991). A do-it yourself usability kit. The Journal of Technical Writing and Communication, 21(4), 351–368.

Chicago/Turabian   Click to copy
Harris, Randy Allen. “A Do-It Yourself Usability Kit.” The Journal of Technical Writing and Communication 21, no. 4 (1991): 351–368.

MLA   Click to copy
Harris, Randy Allen. “A Do-It Yourself Usability Kit.” The Journal of Technical Writing and Communication, vol. 21, no. 4, 1991, pp. 351–68.

@article{randy1991a,
  title = {A do-it yourself usability kit},
  year = {1991},
  issue = {4},
  journal = {The Journal of Technical Writing and Communication},
  pages = {351-368},
  volume = { 21},
  author = {Harris, Randy Allen}
}