Presenting someone else's work as your own is considered plagiarism even if it is done inadvertently.
Honest, ethical, academic work is expected at all levels of higher education. See the Academic Misconduct section of the online Student Handbook published by the UWM Dean of Students Office.
The guides linked below offer information about citing your sources properly. When using a database you can often find all the citation information you need on the article's landing page.
Note: Remember to always verify the database's citation with the information from the full-text or PDF of the article!