Kain, Edward. 2010. “Technique 55: Marriage Norms, Including Exogamy (Intermarriage), Endogamy (Homogamy), Hypergamy and Hypogamy”. TRAILS: Teaching Resources and Innovations Library for Sociology, April. Washington DC: American Sociological Association. https://trails.asanet.org/article/view/technique-55-marriage-norms-including-exogamy.