Depending on your research topic and design, you may need to use datasets or statistics. There are many sources for datasets and statistics. Below are just a sampling of where this information may be found online. Most are freely available except where otherwise noted and some are Bentley Library databases. Some sources below include both statistic and data resources.
Also, keep in mind that many data set sources do not have citation generators that can accurately cite a data set. Consult the style guide for whatever citation style you are using (APA, MLA, etc.) for an example of how to cite a data set to know what information you will need to construct your citation.
You can also consult the following research guide:
Compiled by the U.S. Census, International Statistical Agencies provides links to the official statistical agencies for countries of the world (note: some sites may not provide content in English). Scroll to the bottom of the page to see the full list of countries. Free resource.
World Development Indicators is a compilation of internationally comparable statistical metrics related to global development and the fight against poverty. The database contains time series indicators for more than 200 countries and over 40 country groups. Data for many indicators spans more than 50 years.