Read the transcript of a March 23, 2013, NPR interview in which Focus on the Family’s president, Jim Daly, discusses his concerns about religious liberty aspects of the debate.

Wikipedia keeps its page on same-sex marriage updated with background, links, state-by-state information and charts. Wikipedia also has a page about Christian churches around the world that have approved same-sex marriages. As with any open-source website, information on Wikipedia should be confirmed before it’s used.

The Williams Institute focuses on sexual-orientation law and public policy, and its website has a number of resources on same-sex marriage. Scholars from the think tank, which is based at California’s UCLA law school, participated in friend-of-the-court briefs in both March 2013 cases before they went the Supreme Court.

Rutgers’ law library posts a bibliography of legal literature on the topic.

The National Marriage Project at the University of Virginia conducts research and analysis on marriage issues. Brad Wilcox is director.

NPR has posted a timeline of significant developments in the debate from 1972 through 2012.