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 Association of Holocaust Organizations works to advance programming, research and education about the Holocaust. Member organizations are posted on the website. William L. Shulman is president of the association’s board, as well as president of the Holocaust Resource Center and Archives at Queensborough Community College in Bayside, N.Y.

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.

May 30, 2013, American Thinker article analyzing survey results that show declining support for Israel among Democrats and the strongest support for Israel in America coming from evangelical Christian Republicans.

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

Association for Jewish Studies is a professional organization that promotes Jewish studies in higher learning. It maintains a directory of universities and colleges with Jewish studies programs.

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