James Kervin, More than you ever wanted to know about Glass Beadmaking, pgs.111-126
Loren Stump would be the best teacher. Sally Prasch also teaches murrini making in her soft glass classes.
Any of the japanese videos for floral beads - they always make murrini for them.
Ikuyo Yamanaka's tutorials
https://www.etsy.com/shop/ikuyoglassart