Mustosmäki, A., T. Anttila, and T. Oinas. “Engaged or Not? A Comparative Study on Factors Inducing Work Engagement in Call Center and Service Sector Work”. Nordic Journal of Working Life Studies, vol. 3, no. 1, Jan. 2013, pp. 49-68, doi:10.19154/njwls.v3i1.2520.