CollanaLeiden Indo-European Etymological Dictionary
- Etymological Dictionary of the Iranian Verb (Leiden Indo-European Etymological Dictionary Series) di Johnny Cheung
- Etymological Dictionary of Proto-Celtic (Leiden Indo-European Etymological Dictionary Series) di Ranko Matasović
- Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series, Vol. 10) (English and Greek Edition) di Robert Beekes