Here you can read the interview that ARGIA journalist Xabier Letona gave him in 2014 on the book Egiari zor: "Weapons can be handed over to anyone except Madrid and Paris."
And this other interview was done in 1983. "We have always acted in defence of full independence," added lehendakari.
Another interview in 1991: "The process towards independence is going further and further," Lehendakari said.
ARGIA also dedicated a monograph to Julen Madariaga in December 1993. He was interviewed by Patxi Larrion and can be consulted in this link in PDF format.