The SBL Handbook of Style has become the standard guide for biblical studies. It first released in 1999, and the second edition released in November 2014:

The SBL Handbook of Style: For Biblical Studies and Related Disciplines. 2nd ed. Atlanta: SBL Press, 2014.

More info here.

I reviewed it for the most recent issue of Themelios (which released yesterday). My conclusion:

The second edition of SBLHS is a good and necessary tool for academics who research and write about biblical studies and related disciplines. It significantly improves the first edition, and it will be even more useful when it is available electronically.

If you use Zotero (which I warmly recommend), then you’ll be glad to know that Zotero has already updated the SBL style in accordance with the handbook’s second edition. Details here.

Related: I also reviewed another book for the recent issue of Themelios: New International Dictionary of New Testament Theology and Exegesis, edited by Moisés Silva.