Boas, A. A. V., Santo, C. do E., Moschen, A. D. P., & Lago, M. M. do. (2009). The perception of customers, managers and employees of small companies of hotel industry about sustainability. Revista Ibero-Americana De Estratégia, 7(2), 177–186. https://doi.org/10.5585/ijsm.v7i2.983