1. You are using someone else's words or ideas: This includes direct quotes, paraphrasing, summarizing, or even just presenting a concept that originated with another person.
2. You are using factual information that is not common knowledge: Common knowledge is generally accepted as true and widely known (e.g., the Earth is round). If the information is not generally known or needs a specific source to be verified, you should cite it.
3. You are using images, graphs, charts, or other visual materials that are not your own: Even if you're not using the exact words of someone else, you need to credit the source of the visual materials.
4. You are avoiding plagiarism: Plagiarism is presenting someone else's work as your own. Citing sources helps you avoid this ethical and academic offense.
5. You want to give credit to the original source: Citing sources shows that you are respecting the work of others and acknowledging their contribution to your knowledge.
6. You want your readers to be able to verify your information: Providing citations allows your readers to easily find the original source and verify the accuracy of your information.
7. You are writing for a specific audience: Certain disciplines and audiences have specific expectations regarding citation style and formatting.
In short, it's always better to be safe than sorry. When in doubt, cite!