Puhvel, Jaan (1984), Hittite Etymological Dictionary, vol. 1
& 2, Berlin-New York: Mouton de Gruyter, is a reference
etymological dictionary of the Hittite language with a lot of
textual data, Vol. 2 (words beginning with E and I), second part of
a single book containing vol. 1 (A) and vol. 2 (E-I), is a 256 page
long volume (pp. 249-504).