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Willis N. Hackney Library

Citation Help--APA, MLA , SBL, AMS, ACS, and CSE Styles

This guide explains what citations are and why they're necessary, providing tools and examples for citing sources properly in APA, MLA, SBL, and AMS styles. It also provides access to resources explaining plagiarism and how to avoid it.

APA Style Practice Exercises

Use the following practice exercises from Canada's Royal Roads University to test your skills in using APA style in a variety of areas:  general skills (see the introductory video link on the first page under the "General APA exercise" link), formatting, in-text citations, and reference list:

Online Citation Builders

The following online sites help you build a citation in a variety of formats, including APA.

(Note: Accuracy of citations created using the following online citation building tools may vary; always compare these tool-created citations with the print manuals for both the MLA and APA styles.)

Official APA Style Help Resources from the American Psychological Association--7th Edition

Other Online APA Style Guide Help

A Word About Digital Object Identifier (DOI) Numbers...

According to the APA's web site

DOI is a unique alphanumeric string that identifies content and provides a persistent link to its location on the internet. DOIs can be found in database records and the reference lists of published works.

  • The DOI is often located on the first page of the electronic journal article, near the copyright notice. The DOI can also often be found on the database landing page for the article.
  • The main reason for DOI numbers is to provide a stable link to electronic articles accessible on the web.  The system is set up so that the DOI numbers will not change, and the articles and other digital documents that use them should remain accessible by using the DOI number to access them.
  • However, some articles do not have DOI numbers, especially those that were published before the 2000s, and the APA Manual gives you alternative options for articles in that situation.  They provide some clarification about when to use a DOI number and when to use a URL in a citation to an electronic journal article from a database in a flowchart from the APA blog.  Ultimately, though, your instructor is the final arbiter on how you cite journal articles without DOI numbers.
  • There are two formats for DOI numbers; one that is not a link, and one that is a clickable link.  See the two examples below:
    • Example 1: A typical DOI number in non-link format:  10.1007/s10699-014-9361-3
    • Example 2: A typical DOI number in link format (with the https:// included):  https://doi:10.1080/1057610X.2013.832117

Note:  In APA style (7th edition), the DOI number is required to be represented as a clickable link.  More recent DOI numbers are typically already in clickable link format (such as in Example 2 above).  If, however,  the DOI you are citing is not in link format (as in Example 1 above), you must convert it to a link by doing the following (as shown below using the DOI in Example 1 above):

To convert a non-link DOI to a clickable link:

  • Drop the "doi:" and add (illustrated in blue below) directly in front of the actual DOI number (with no spaces):