https://www.amazon.com/MicroC-OS-II-Kernel-CD-ROM/dp/1578201039
Wow, never heard about that book but just looking at the ToC makes me
want to get one :-)
The original uC/OS I book published in 1992 was the one that really
established uC/OS and led to Micrium. I think that is this book:
https://www.amazon.com/gp/product/0132429675 but I am not sure. Might
be
https://www.amazon.com/MC-Real-Time-Kernel-Jean-Labrosse/dp/0879304448.
I have never had a copy, but I understand that it had the whole uC/OS
source code in the book. It was still proprietary but everyone used it
because the source code was available.