This piece uses Marxist theory to examine aspects of alienation on MTurk. It cites the work of Lily Irani quite a bit, and is interesting, if you like that Marxist stuff.
Karin Hansson,Tanja Aitamurto, Thomas Ludwig, Michael Muller (2016): From alienation to relation: Modes of production in crowd work.
In Karin Hansson, Tanja Aitamurto, Thomas Ludwig, Michael Muller
(Eds.), International Reports on Socio-Informatics (IRSI), Proceedings of the CSCW 2016
– Workshop: Toward a Typology of Participation in Crowdwork (Vol.13,Iss.1, pp.13-22)