Well I'm not so sure about acknowledgement from universities, but I have a bunch (lol, a lot) of suggestions for you -
Anything and Everything by Ian Stewart - Especially 17 equations that changed the world, and Letters to a young mathematician. He's written a lot.
A Mathematical Naturewalk, if you're interested in the mathematics behind nature
An Imaginary tale, Zero (the biography of a dangerous idea), Alex's Adventures in Numberland - Obviously books about numbers..
Why do Buses come in threes?, How long is a piece of string? - A pair (same author) that looks at aspects of ordinary life, and how maths can deal with and improve them.
The man who only loved numbers - Biography of Paul Erdos, very good book.
The strangest man - Biography of Paul Dirac (mathematical physicist).
A Mathematicians Apology, by G.H Hardy - Probably the book most uni's will take notice of - http://www.math.ualberta.ca/~mss/mis...%20Apology.pdf
You'll also get a good deal of knowledge and insight by reading proofs of theorems (and understanding the theorems themselves), or figuring out fallacies, and such. Here's a great site filled with them: http://www.cut-the-knot.org/proofs/index.shtml
Finally, one of my lecturer's websites; everything under the section "Teaching Advice", I've found useful in studying. http://marasingha.org/mathspages/index.html
Last edited by FireGarden; 22-06-2012 at 00:20.