Hello Sumiran,

Is this website of any help?

https://mturk4academics.wordpress.com/2016/04/07/recent-studies-on-mturk-validity/

Or this paper:

Bartneck, C., Duenser, A., Moltchanova, E., & Zawieska, K. (2015). Comparing the similarity of responses received from studies in Amazon’s Mechanical Turk to studies conducted online and with direct recruitment. PloS one, 10(4), e0121595.

https://www.researchgate.net/publication/275238524_Comparing_the_Similarity_of_Responses_Received_from_Studies_in_Amazon's_Mechanical_Turk_to_Studies_Conducted_Online_and_with_Direct_Recruitment

Very best wishes,

Mary

Article Comparing the Similarity of Responses Received from Studies ...

There are certainly high criticism on MTurk but somehow it have some validity, but I would advice to avoid it rather trying to check its validity by yourself.

http://www.workfromhomewatchdog.com/is-amazon-mechanical-turk-a-scam/

https://www.linkedin.com/pulse/my-experience-amazon-mechanical-turk-mturk-worker-utpal-dholakia

http://www.forbes.com/sites/timworstall/2013/03/19/on-the-new-york-times-stupidity-over-amazons-mechanical-turk/#429631e51660