The main limitations of this research are sample size, which,
despite all the effort made on data collection, only included 75
participating companies, and the restriction of analyzing a single
industrial sector. Another limitation concerns the existence of
overlaps between HR, EM and LM variables, as discussed by Dües
et al. (2013). Finally, it is believed that future studies are needed
to better understand the reasons for the poor integration between
human resource management practices and environmental
management practices at analyzed companies.