İlbay, B. and Akoğlan Kozak, M. (2020) “The effect of Human Sigma Model on service orientation in hotel enterprises: Otel işletmelerinde İnsani Sigma Modeli’nin hizmet odaklılığa etkisi”, Journal of Human Sciences, 17(1), pp. 217–245. doi: 10.14687/jhs.v17i1.5901.