Paul, Diane B. & Spencer, Hamish G.: “It's Ok, We're Not Cousins by Blood”: The Cousin Marriage Controversy in Historical Perspective. PLOS Biology, 2008, 6. vsk, nro 12, s. e320. doi:10.1371/journal.pbio.0060320. Artikkelin verkkoversio. Viitattu 7.11.2019. (englanniksi)
Paul, Diane B. & Spencer, Hamish G.: “It's Ok, We're Not Cousins by Blood”: The Cousin Marriage Controversy in Historical Perspective. PLOS Biology, 2008, 6. vsk, nro 12, s. e320. doi:10.1371/journal.pbio.0060320. Artikkelin verkkoversio. Viitattu 7.11.2019. (englanniksi)