Whenever possible, look for peer-reviewed empirical research. These are articles or books written by experts in your field of interest, whose work has been read and vouched for by other experts in the same field. These can be found in scientific journals or via an online search.
MLA format is typically used for literary research papers and uses a ‘works cited’ page at the end. This format requires in-text citations.
You need to be sure to understand everything clearly when you choose an essay topic. Do not hesitate to ask questions if there are some unclear points. The more you understand the simpler it is for you to write a successful research paper. If the indistinct issues are still at large, it is advisable to leave this topic be and simply select another one. You need to show the readers that you master of the topic and not a confused newbie who does not know what he or she is talking about.
A research paper is an expanded essay that presents your own interpretation or evaluation or argument. When you write an essay, you use everything that you personally know and have thought about a subject. When you write a research paper you build upon what you know about the subject and make a deliberate attempt to find out what experts know. A research paper involves surveying a field of knowledge in order to find the best possible information in that field. And that survey can be orderly and focused, if you know how to approach it. Do not worry--you would not get lost in a sea of sources.