We suggest that you refer to your organization’s or professor’s citation guidelines for how to specifically cite sources from websites like BibleGateway.com.
You might also try Calvin College’s KnightCite, which will walk you through the citation process:
http://www.calvin.edu/library/knightcite/index.php
Here are the websites for the most common style guides:
APA: http://apastyle.apa.org/
MLA: http://www.mla.org/style
Chicago: http://www.chicagomanualofstyle.org/home.html
...and a few sites from universities with more guidelines:
http://www.lib.washington.edu/research/wri.html
http://library.duke.edu/research/citing/
http://owl.english.purdue.edu/owl/resource/560/01/
Here are some tools that provide automated citation help:
http://www.bibme.org/
http://www.easybib.com/