Amazon's Mechanical Turk: A New Source of Inexpensive, Yet High-Quality, Data?
Perspectives on Psychological Science (2011) - Comment
pubmed: 26162106  doi: 10.1177/1745691610393980  issn: 1745-6916  issn: 1745-6924 

Michael Buhrmester, Tracy Kwang, Samuel D. Gosling