Tischler, L., Biberman, J., & McKeage, R. (2002). Linking emotional intelligence, spirituality and workplace performance. Journal of Management Psychology, 17(3), 203-218.
Walter, F., Cole, M. S., & Humphrey, R. H. (2011). Emotional Intelligence: Sine Qua Non of Leadership or Folderol? academy of Management Perspective, February, 45-59.
You might wish to look at some of the text books of Organisational behaviour! such as Kalliath, Brough, O'Driscoll, Manimala, Siu, and Parker, (2014) 2nd edition, McGraw-Hill
The case is at a poultry plant in Italy, a major supplier of McDonalds, where there's a pretty strong link between EQ, managerial performance, and organizational performance.