Remember to check with your instructor. Some instructors might not allow any use of ChatGPT and others might allow only limited use.
If you are allowed to use ChatGPT in an academic assignment, here are some guidelines for citing.
Your instructor may also ask for an appendix that includes the prompts that you provided to ChatGPT or the full transcript of your interaction.
See also this summary of ways to acknowledge use of generative AI: Acknowledging and Citing Generative AI in Academic Work from the book Write What Matters!
It's also worth reading this advice by Dr. Kristin Terrill of Iowa State University, since some uses don't fit the standard way of citing:
This guide is based on "Student Guide to ChatGPT" by University of Arizona Libraries is licensed under CC BY 4.0