P. Hamp Eric. „Indo‑European ’ego’, Slavic Ja = Runic Ek, and Celtic Ø“. Slavia Centralis 4, no. 1 (oktober 14, 2020): 5–13. Pridobljeno julij 22, 2024. https://journals.um.si/index.php/slaviacentralis/article/view/675.