Parameswaran, A. & Polyzotis, N. (2011), Answering Queries using Humans, Algorithms and Databases, in 'Conference on Inovative Data Systems Research (CIDR 2011)', pp. 160--166.

Little, G.; Chilton, L. B.; Goldman, M. & Miller, R. C. (2010), TurKit: human computation algorithms on mechanical turk, in 'Proceedings of the 23nd annual ACM symposium on User interface software and technology', ACM, New York, NY, USA, pp. 57--66.