I've always been partial to this TAM 212 online reference from UIUC. I don't know what the professor used to generate it but many of the diagrams are interacti

I've always been partial to this TAM 212 online reference from UIUC. I don't know what the professor used to generate it but many of the diagrams are interactive and help build intuitive understanding of the material. http://dynref.engr.illinois.edu/ref.html http://dynref.engr.illinois.edu/ref.html