^Wood, Elizabeth T et al 2005 Contrasting patterns of Y chromosome and mtDNA variation in Africa: evidence for sex-biased demographic processes; also Appendix A
^Naidoo, Thijessen et al 2010, Development of a single base extension method to resolve Y chromosome haplogroups in sub-Saharan African populations
^Tishkoff, Sarah A. et al 2007 History of Click-Speaking Populations of Africa Inferred from mtDNA and Y Chromosome Genetic Variation