Physics researchers typically use a range of citation styles including APA and CSE. It's always best to ask your professor if they have a particular citation style that they would like you to use for your assignments. Below is a link to the library's citation guide where you'll find some basic help.
Make an appointment with a librarian anytime you have questions about citation styles or citing a tricky source.
Watch this short video from the University of Arkansas Libraries to learn what a citation is and how to read one