APA   Click to copy
Trathen, S., & Varadarajan, S. (2013). Archtypes of design practice.

Chicago/Turabian   Click to copy
Trathen, S., and S. Varadarajan. “Archtypes of Design Practice” (2013).

MLA   Click to copy
Trathen, S., and S. Varadarajan. Archtypes of Design Practice. 2013.

@article{s2013a,
  title = {Archtypes of design practice},
  year = {2013},
  author = {Trathen, S. and Varadarajan, S.}
}