It's important to cite your sources, for a variety of reasons:
"If it is not your original words or ideas, give credit to the person whose words or ideas you are using," advises the UA's Dean of Students Office. Plagiarism violates the UA Code of Academic Integrity. You don't want to face these sanctions.
There are a variety of citation styles. Use the one specified by your instructor. If one isn't specified, the field of business typically uses American Psychological Association (APA) style.
These guides will help you format citations correctly: