Crowdsourcing for NLP Chris Callison-Burch author Lyle Ungar author Ellie Pavlick author 2015-may–jun text Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Tutorial Abstracts Yang Liu editor Thamar Solorio editor Association for Computational Linguistics Denver, Colorado conference publication callison-burch-etal-2015-crowdsourcing 10.3115/v1/N15-4002 https://aclanthology.org/N15-4002/ 2015-may–jun 2 3