x86 boot process book recommendation?

Hello, I'm researching a UEFI malware (proof of concept) that was showcased at a recent BlackHat event for my masters program and I'm having trouble concretely understanding the boot process (16-bit --> 32-bit --> 64-bit), the different phases (like SEC), and finally jumping into the UEFI BIOS. Specifically, understanding the chain of trust is really important. I have some understanding just by reading the assembly but still its not always clear whats going on.

I suppose the stuff before the UEFI code is not CRAZY important but I believe having a firm grasp on that would help me when I start diving deeper into UEFI world.

Does anyone here have any good book recommendations? Or maybe resources that they've used in the past that did a good job of explaining the initial boot process?