However, all Chinese languages use the same written representation, so any Chinese person speaking a dialect of Chinese that is literate is as literate as a Mandarin-speaker.
http://www.amazon.com/Chinese-Language-Fantasy-John-DeFranci...
or
http://www.amazon.com/Ideogram-Chinese-Characters-Disembodie...
For your convenience, I can link a deep look into one of those books through a focused search on Google Books: