Please introduce me some books for the CRNE, which can write the knowledges clear,and not have many practice in it.Because I have no foundation.So I want to study the knowledges first and then to do some practice.I have bought books about the CRNE that is the Study Guide Medical Surgical Nursing in Cananda.But in this book ,there is all of practice.I even can not understand the point which want to me answer.So please help me!I really need some books contain the knowledges to study.