The body is for the expansion of your points, which may be in favor or against the topic. It is advisable to cite references of all those sources that you have used while doing the topic research. The opinion of others can be given, in your own words. However, care should be taken that there is no issue of plagiarism involved while doing so. References for the works cited are necessary for this purpose. The bibliography and citation reference page should come at the end of the essay so that the reader can access you researched sources and judge your ability of paraphrasing any material from the same by you.