Sources are In Order Of Appearance
Proarch3d.com traditional animation process article
Alfred Hitchcock’s ‘the birds’ & family plot, & 127 hours storyboard via Rocketjump Film School
6-minute Speed Course Storyboarding with J.Todd Anderson (from the eyes on cinema YouTube channel)
The Purpose of Storyboarding (from the Picassosson youtube channel)
Patsy Animatic Scene 1 With Scratch Track (from the Elliot Crutchley youtube channel)
Brother Bear Deleted Scene & Bonus Material Ripped From The Film's DVD
Timing animation to music (bar sheet image)
Animation - clear posing for story boarding (from the "The Art of Aaron Blaise" YouTube channel)
How to make animated feature film: hand drawn animation (from the Signe Baumane YouTube channel)
Making 1 sec of hand painted cel animation (from the Sheila Graber YouTube channel)
How to draw backgrounds (1-point perspective) (from the Markcrilley YouTube channel)
History of cel animation (from the Tompreston6 YouTube channel)