Writing a presentation or report usually requires information from many sources (for example, a company's 10-K, market research reports, newspaper articles).
To maintain your professional and academic reputation, you must cite every source.
In the academic setting, we use formalized styles of attribution. Formatting your citations in a format like APA is just a standardized means of giving credit to the person or company who created the content you use. The content creator may be an author, blogger, photographer, or your professor, for example. Outside of academia, you'll probably cite your work in different ways. For a list of great examples, see Corey Eridon's blog post .
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