Kittelman, Sage McKenzie. “ASSESSING THE BEHAVIOR OF HUMAN ACTIVITY SYSTEMS THROUGH THE OBSERVATION AND INTERPRETATION OF SOCIOTECHNICAL SIGNS”. Proceedings of the 63rd Annual Meeting of the ISSS - 2019 Corvallis, OR, USA 63, no. 1 (April 8, 2020). Accessed October 23, 2021. https://journals.isss.org/index.php/proceedings63rd/article/view/3573.