diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index d49708442..a16ca652e 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -789,7 +789,6 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [How to write a simple operating system in assembly language](https://mikeos.sourceforge.net/write-your-own-os.html) - Mike Saunders (HTML)
 * [Linux Kernel in a Nutshell](http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration) - Greg Kroah-Hartman (HTML)
 * [Making Servers Work: A Practical Guide to Linux System Administration](https://www.digitalocean.com/community/books/sysadmin-ebook-making-servers-work) - Jamon Camisso (PDF, EPUB)
-* [Operating Systems and Middleware](https://gustavus.edu/mcs/max/os-book/) - Max Hailperin (PDF, LaTeX)
 * [Operating Systems: From 0 to 1](https://github.com/tuhdo/os01/releases/tag/0.0.1) - Tu, Ho Doang (PDF) ( :construction: *in process*)
 * [Operating Systems: Three Easy Pieces](https://pages.cs.wisc.edu/~remzi/OSTEP/) - Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau (PDF)
 * [Practical File System Design: The Be File System](https://www.nobius.org/~dbg/practical-file-system-design.pdf) - Dominic Giampaolo (PDF)