I'm not sure there is a compact reference that will have all the information you want. You might be forced into purchasing a small collection of books. The O'reilly series of books are usually pretty good about giving good information. I have a couple myself. You can snoop around their site: O'Reilly Website
Of their books, I have two geared toward administration (more or less):
"Running Linux" - (discusses various administration tasks)
MSRP - US$34.95
"Linux in a Nutshell" - reference for user and admin commands (descriptions and common switches)
MSRP - US$24.95
I also own another very good book titled:
"Linux Administration Handbook"
Publisher: Prentice Hall
MSRP - US$49.99
Don't let the cartoon characters fool you on the cover
It's a serious book, and it gives background for why things are the way they are, and touches just about everything you can think of.