Löpelmann, Martin. 1968. Etymologisches Wörterbuch der baskischen Sprache. (2.) Berlin: de Gruyter.
@book{kortmannadverbial-Lopelmann1968,
address = {Berlin},
author = {Löpelmann, Martin},
publisher = {de Gruyter},
title = {Etymologisches Wörterbuch der baskischen Sprache},
volume = {2},
year = {1968}
}