Q. I'm having a hard time finding the DOI number for an article I'm trying to cite in APA format found from Academic Search Complete.

DOIs (Digital Object Identifiers) are available from the journal publisher, usually with the article record or in the first page of the article. Please note that a DOI may not exist for every article.

Databases, like Academic Search Complete, do not always have the DOI in the record representing the article. In those instances, looking on the publisher's web site will help identify if a DOI is available.

You can also use the PubMed Single Citation Matcher to look up the article and see if the DOI information is available.

1. Connect to PubMed.
2. Click on Single Citation Matcher under the Find column.
3. Fill in a few of the fields (Journal, Volume, 1st page number work great if you have those pieces of the reference).
4. Click Search.
5. Use the Find It @UTMB button to access the full article.

You can also try using the CrossRef DOI Lookup:  http://www.crossref.org/guestquery/