Mao, A., Kamar, E., Chen, Y., Horvitz, E., Schwamb, M., Lintott, C., & Smith, A. (2013). Volunteering Versus Work for Pay: Incentives and Tradeoffs in Crowdsourcing. Proceedings of the AAAI Conference on Human Computation and Crowdsourcing, 1(1), 94-102. https://doi.org/10.1609/hcomp.v1i1.13075