If you are oriented towards a quaker but don't know much about parrots yet, this book is the best to have a quick resume of everything is important to know. Takes little time to read it all but at the end your ideas will be a lot clearer, you'll know the essential to make your decision about getting a companion quaker or not; and in case you've decided to go for it, the essential to take care of your quaker and make it healthy and happy. In a second time you can deepen in your knowledge with more complex (but potentially confusing for a novice) books on the subject.
The text is quite objective about the level of attention and cares they require but... *beware*, the photos are so endearing that you are not much likely to resist the urge to get one of this cute and intelligent birds right away and start cuddling it...