APA   Click to copy
Kocielnik, R., Xiao, L., Avrahami, D., & Hsieh, G. (2018). Reflection Companion: A Conversational System for Engaging Users in Reflection on Physical Activity. Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies Archive, 2(2).

Chicago/Turabian   Click to copy
Kocielnik, Rafal, Lillian Xiao, Daniel Avrahami, and Gary Hsieh. “Reflection Companion: A Conversational System for Engaging Users in Reflection on Physical Activity.” Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies archive 2, no. 2 (June 4, 2018).

MLA   Click to copy
Kocielnik, Rafal, et al. “Reflection Companion: A Conversational System for Engaging Users in Reflection on Physical Activity.” Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies Archive, vol. 2, no. 2, June 2018.

@article{rafal2018a,
  title = {Reflection Companion: A Conversational System for Engaging Users in Reflection on Physical Activity},
  year = {2018},
  month = jun,
  day = {4},
  issue = {2},
  journal = {Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies archive},
  volume = {2},
  author = {Kocielnik, Rafal and Xiao, Lillian and Avrahami, Daniel and Hsieh, Gary},
  month_numeric = {6}
}