The Citadel

https://soundcloud.com/sfinsfpodcast/august-2018-george-rr-martin-special-event

https://www.publishersweekly.com/pw/by-topic/authors/interviews/article/77516-pw-talks-with-george-r-r-martin.html

[Note: The link goes to the Google Translate translation of the original article.]

https://web.archive.org/web/20201120070201/https://www.esquire.com.cn/2017/1108/255994.shtml

https://meduza.io/en/feature/2017/08/22/fantasy-needs-magic

http://time.com/4791258/game-of-thrones-george-r-r-martin-interview/

[Note: This is a long interview, but bear in mind that there's a significant focus on George's love of comics and his involvement in comics fandoms in his earlier years. However, at the end there's a fun snippet shared by Edelman, of an interview he did in 1993 in which GRRM mentioned in passing that he was working off-and-on on a fantasy novel.]

http://www.scottedelman.com/2017/07/21/down-drunken-noodles-with-george-r-r-martin-in-episode-43-of-eating-the-fantastic/