You can also get a free PDF version of that textbook here https://www.distributed-systems.net/index.php/books/ds4/ https://www.distributed-systems.net/index.php

You can also get a free PDF version of that textbook here https://www.distributed-systems.net/index.php/books/ds4/ https://www.distributed-systems.net/index.php/books/ds4/ (you only need to provide an email)