The authoritative source for using Subversion is still the http://svnbook.red-bean.com/ but this book is a nice introduction for anyone who is using a version control system for the first time.

The examples are clear and simple. But more importantly, the examples are not just snippets; they are properly documented step-by-step so that anyone new to version control can actually try it out.

Moreover, if you really need a quick start, all you need to do is read the first 2 chapters. Reading the first 2 chapters will not make you a pro but at least you are now equipped with the knowledge to use Subversion in your own projects.