Bouchard, Denis. "1. INTRODUCTION". On the Content of Empty Categories, Berlin, Boston: De Gruyter Mouton, 1983, pp. 1-10. https://doi.org/10.1515/9783110850000-001
Bouchard, D. (1983). 1. INTRODUCTION. In On the Content of Empty Categories (pp. 1-10). Berlin, Boston: De Gruyter Mouton. https://doi.org/10.1515/9783110850000-001