It is very important to write references according to some rules in order to avoid mistakes. First of all, you should pay attention to the sources you have used for writing your work. They should coincide with the topic of your work. They should be chosen according to the following way: sources should contain pros and cons. You should show a good knowledge of the subject, paying attention to different opinions and solutions. You also need to write a good reference page according to the citation style given by your instructor. All these facts will help you succeed in writing references.