Skip to Main Content

Natural and Earth Science

APA Style

APA Style is used primarily in the social and behavioral sciences, such as Psychology, Sociology, and similar disciplines.

Use the following links from the Purdue Online Writing Lab (OWL) to format your:

  1. APA Paper
  2. Reference List
  3. APA In-text Citations

Additionally, the library has a print copy of the APA manual. See below for further information on finding a copy:

If you're not sure about how to cite sources, contact the writing center or




By searching the APA Style Blog, you can find the answers to many of those hard to answer citation questions like "How do I cite a Tweet" or "How do I cite a hashtag"?


What is a DOI?

DOI stands for Digital Object Identifier, which is an alphanumeric string of characters used to identify sources.  If a source has a DOI, you must include that in your citation.

What does a DOI look like?

Here is an example of a DOI -

APA Citation Style - Website Help

Use the following links from the Purdue Online Writing Lab (OWL) to format your:

1.  Paper 
2.  Reference List 
3.  In-text Citations


Still have questions?

  1. Make an appointment with any of the Research and Instruction librarians by calling 651-2215.
  2. Contact the Writing Center or Ask a Librarian.