Races, ethnies, and cultural phenomenons of endogamy

https://www.youtube.com/watch?v=WQwzEKFdTL4

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1180403/

https://www.sciencedirect.com/science/article/pii/S1872497315300168

https://www.ncbi.nlm.nih.gov/pubmed/30956897