1. Baldinger, Kurt (ed.), Etymologien. Untersuchungen zu FEW 21–23, 3 vols., Tübingen, Niemeyer, 1988–2003.
2. Bloomfield, Leonard, Review of Jespersen 1922, American journal of philology 43 (1922), 370–373.
3. Buchi, Éva/Dworkin, Steven N., Etymology in Romance, in: Oxford research encyclopedia in linguistics, New York/Oxford, Oxford University Press, 2019, 1–24.
4. DCECH = Corominas, Joan/Pascual, José Antonio, Diccionario crítico etimológico castellano e hispánica, 6 vols., Madrid, Gredos, 1980–1991.
5. DECat = Coromines, Joan, Diccionari etimològic e complementari de la llengua catalana, 10 vols., Barcelona, Curiel, 1980–2001.