Walejko, G., and T. Ksiazek. “The Politics of Sourcing: A Study of Journalistic Practices in the Blogosphere”. Proceedings of the International AAAI Conference on Web and Social Media, vol. 2, no. 1, Sept. 2021, pp. 145-51, https://ojs.aaai.org/index.php/ICWSM/article/view/18628.