That's a pretty good list. I consider these books to be amongst the very best:-
I Hear A Symphony: Motown & Crossover R&B - Andrew Flory
Stevie Wonder: A Musical Guide To The Classic Albums - Steve Lodder
Motown: Hot Wax, City Cool, Solid Gold - J Randy Taraborrelli
The Wonder Years: My Life & Times With Stevie Wonder - Ted Hull
Hitsville! The Birth Of Tamla Motown - Keith Rylatt
Motown's First A&R Man Presents The A&R Man - Mickey Stevenson
And, if you've read the Hollands' book, you ought to read:-
How Sweet It Is - Lamont Dozier
The first book I came across, that treated Motown seriously was:-
Motown - David Morse
But I need to re-read it as I don't remember it very well!
J Randy Taraborrelli's scurrilous Call Her Ms Ross contains the results of his interviews with several Motowners and is worth picking through to find some nuggets.
There was a (not very well written) book about Junior Walker. It has the most fascinating back story that I have told to a script-writer because it would make a good film. I forget the author and title.
I'll keep thinking.
SWI