You should always check with your instructor about proper citation styles for your course projects, but the Chicago Manual of Style is commonly used for this field.
You will need to compile a list of all the sources you use in a bibliography at the end of your research paper. In addition, you will need to cite every piece of information you use from other resources throughout your paper in footnotes/endnotes or in-text citations. Your instructor should let you know their preference. Though bibliography and footnote/endnote citations look similar, they are formatted slightly differently.
Bibliography
Last Name, First Name. "Title." Publisher, Date. URL (if not from a database), accessed Date.
Footnote/Endnote
First and Last Name, "Title," Publisher, Date, Page Number (if applicable/available), URL (if not from a database), accessed Date.
Repeated citations in your footnotes/endnotes can be abbreviated.
Note that [Market report] is used to describe the report. Include the database name in your citation.
You can also use Mintel to create tables and graphs using the Interactive Databook. These should be cited as [Data set]. Because the databook is not attributed to a person as the author, cite Mintel as the author.