Why cite sources? Basic reasons include:
Whether you are quoting, paraphrasing, copying and pasting, or just referencing, you do need to cite:
Please remember this list is not exhaustive, and it does apply to most citation style guidelines! If you're uncertain when to cite something, check with your instructor, ask a librarian, or seek the answer in the appropriate style manual.
Image used under Creative Commons License from Randall Munroe