Gina Berriault gave few interviews. One I could find on-line is this radio interview on NPR (7:00).
If you care to sign up for a free trial of some sort, apparently you can get to a widely cited interview from the Literary Review. I did not sign up, so feel free to share if you do…..
Due to the dearth of Berriault interviews, here is a link to a short bio of Gina Berriault at the Rhea Award for the Short Story.
Discussing Libra, DeLillo said: “But fiction can counteract some of the ambiguity and try to rescue history from its confusions. Stories are a consolation; fiction can be a balm.” The New York Times (July 19, 1988) (free access, login required).
The Don Dellilo Society has a comprehensive listing (often with helpful links) of DeLillo interviews. Peruse at your leisure.