The Art of Moving Points
This book is available for download with iBooks on your Mac or iOS device. Multi-touch books can be read with iBooks on your Mac or iOS device. Books with interactive features may work best on an iOS device. iBooks on your Mac requires OS X 10.9 or later.
The “Art of Moving Points” is designed for the intermediate to advanced Character Rigger or Character Modeler that wants to learn a different approach to character facial articulation using point weight containers, and assigning them to deformers to move points in space. The “Art of Moving Points” is also an excellent source for Character Modelers who are designing character facial meshes for production. Character facial articulation is extremely challenging, and The “Art of Moving Points” breaks down the modeling and articulation process using three formats: text, illustrations and videos.
Outstanding resource for Articulators
I think that this book should be considered a "must own" for anyone serious about learning how to articulate a 3D character's face. This book goes into extreme details not so much on the tools but on the concepts, or theory, around how to move points in a CG face properly.
I can't stress enough how eye opening this resource will be for students of this craft. If you want to create a 3D character and animate it, you NEED this book.