Special attention should be given to the date of publication of the resources you select for your papers. The Catholic Church underwent tremendous changes in 1965 with the Second Vatican Council. As a result, materials published before 1965 represent an historic view of Catholic theology. Materials published after 1965 reflect current Catholic theology.
Here are a few news sources to get you started. To find others, including historical newspapers, visit the full Newspapers Guide.
Questions to consider:
Purpose, author, and relevance help you choose sources and also present your research to your audience. If you use a source that has clear bias, you can give that context to your audience.