www.oberk.com/HistoryofGlassBlowing
www.hollywoodhotglass.com
www.curlie.org/Arts/Crafts/Glass/Blowing
www.artsheaven.com/the-art-of-glass-blowing/
www.sacramentoartglass.com/the-process-of-blowing-glass.html
https://en.wikipedia.org/wiki/Glassblowing
https://www.youtube.com/c/LiveLaughLoveArt/videos