Intel Press published the first and second editions of these two books a few years ago, but it appears Degruyter is publishing revised third editions!
Harnessing the UEFI Shell: Moving the Platform Beyond DOS, Third Edition
Rothman, Michael / Zimmer, Vincent / Lewis, Tim
Beyond BIOS: Developing with the Unified Extensible Firmware Interface, Third Edition
Zimmer, Vincent / Marisetty, Suresh / Rothman, Michael
Vincent Zimmer of Intel UEFI has posted TWO blog posts, to catch up to.
In the first, he point out some newly-released Intel FSP 2.0 documents:
In the second, he talks about UEFI history, focused on the 2 editions of the Beyond BIOS book (and the recent UEFI reference book in comic book pop culture).
PS: Intel Press, the web pages (including errata) for the Beyond BIOS 2nd Edition and UEFI Shell books are broken. It sucks to have an $80 book with a broken web site. Nothing personal, it seems most tech book publishers are terrible at persistant web sites and ‘cool URIs’. 😦