Scholarly encyclopedias, handbooks, bibliographies, and other reference works are a great place to start and provide helpful overviews of/citations to the relevant scholarship.
Includes key reference series such as the Cambridge Companions and Cambridge Histories. Individual titles include The Cambridge Companion to American Science Fiction.
A large collection of annotated bibliographies - e.g., "Science Fiction Film Theory and Criticism."
Often a helpful starting point. Books here include The Oxford Handbook of Science Fiction.
Documenting the sources you use in your research paper is a key part of the research and writing process. Complete and accurate citations to the books, journal articles, primary sources, and other items you use will allow readers to verify your sources and explore them further if they'd like to learn more about the issues you've raised.
In the field of literature, the standard citation style is the MLA (Modern Language Association) Style: