KAYIHAN, B., YELEK, M.S. and KARA, N. 2026. Institutional Structure, Union Density and Voluntary Sustainability Commitments: A Panel Data Analysis of European Countries. International Journal of Contemporary Economics and Administrative Sciences. 16, 1 (Jun. 2026), 1108–1133. DOI:https://doi.org/10.5281/zenodo.20800553.