"The Systems Bible", also known as Systemantics, is a classic and highly recommended. It's probably not what you expect: it covers systems in general, and large complex systems in particular. It's not specific to computer systems let alone any particular flavor of computer system - these are rules which apply to all systems, from a municipal garbage collection program to a supertanker. Yet if you've ever dealt with a real-world distributed system you'll find it surprisingly relevant and timeless.