How to cite this particular piece of software?

1. Does the software tell you how to cite it?

If yes, then do so following their guidelines and you are done!
If no, then continue to question 2
If you don't know:
- Check for a file name CITATION or similar in the root directory of the software.
- Check the README for the software, their website, and any output from running it.
- Search the web for citation instructions: "How to cite 'software name'?".
- Check download page.
- Email the authors, open an issue in their issue tracker, or ask on a user support forum. While waiting for a response continue to question 2.

2. Is there a DOI for the software itself?

If yes, then use doi2bib.org to get a citation.
If not, or if you don't know, continue to question 3.

3. Is there a software paper and does it have a link to the software?

If yes, then cite the paper. Either use doi2bib.org to get the citation or construct a citation online using the software paper.
If not, the construct a citation online using the URL to the software.

4. Try CiteAs

http://citeas.org/

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