APA (7th ed.) Citation

Doan, A., Ramakrishnan, R., & Halevy, A. Y. (2011). Crowdsourcing Systems on the World-Wide Web. Communications of the ACM, 54(4), 86. https://doi.org/10.1145/1924421.1924442

Chicago Style (17th ed.) Citation

Doan, Anhai, Raghu Ramakrishnan, and Alon Y. Halevy. "Crowdsourcing Systems on the World-Wide Web." Communications of the ACM 54, no. 4 (2011): 86. https://doi.org/10.1145/1924421.1924442.

MLA (9th ed.) Citation

Doan, Anhai, et al. "Crowdsourcing Systems on the World-Wide Web." Communications of the ACM, vol. 54, no. 4, 2011, p. 86, https://doi.org/10.1145/1924421.1924442.