Bryant, Vaughn M., Jr. (1998). „Pre-Clovis”. Ур.: Gibbon, Guy E. Archaeology of Prehistoric Native America: An Encyclopedia. Taylor & Francis. стр. 682—683. ISBN978-0-8153-0725-9.
Viegas, Jennifer. „First Americans Endured 20,000-Year Layover”. Discovery News. Архивирано из оригинала 13. 3. 2012. г. „Archaeological evidence, in fact, recognizes that people started to leave Beringia for the New World around 40,000 years ago, but rapid expansion into North America didn't occur until about 15,000 years ago, when the ice had literally broken”CS1 одржавање: Формат датума (веза)
Saillard, Juliette; Forster, Peter; Lynnerup, Niels; Bandelt, Hans-Jürgen; Nørby, Søren (септембар 2000). „mtDNA Variation among Greenland Eskimos: The Edge of the Beringian Expansion”. American Journal of Human Genetics. 67 (3): 718—726. PMC1287530. PMID10924403. doi:10.1086/303038. „The relatively lower coalescence time of the entire haplogroup A2 including the shared sub-arctic branches A2b (Siberians and Inuit) and A2a (Eskimos and Na-Dené) is probably due to secondary expansions of haplogroup A2 from the Beringia area, which would have averaged the overall internal variation of haplogroup A2 in North America.”CS1 одржавање: Формат датума (веза)
Tymchuk, Wendy (2008). „Learn about Y-DNA Haplogroup Q-M242”. Genebase Systems. Архивирано из оригинала 22. 6. 2010. г. „Haplogroups are defined by unique mutation events such as single nucleotide polymorphisms, or SNPs. These SNPs mark the branch of a haplogroup, and indicate that all descendants of that haplogroup at one time shared a common ancestor. The Y-DNA SNP mutations were passed from father to son over thousands of years. Over time, additional SNPs occur within a haplogroup, leading to new lineages. These new lineages are considered subclades of the haplogroup. Each time a new mutation occurs, there is a new branch in the haplogroup, and therefore a new subclade. Haplogroup Q, possibly the youngest of the 20 Y-chromosome haplogroups, originated with the SNP mutation M242 in a man from Haplogroup P that likely lived in Siberia approximately 15,000 to 20,000 years before present”CS1 одржавање: Формат датума (веза)
Than, Ker (2008). „New World Settlers Took 20,000-Year Pit Stop”. National Geographic Society. „Over time descendants developed a unique culture—one that was different from the original migrants' way of life in Asia but which contained seeds of the new cultures that would eventually appear throughout the Americas”
Saillard, Juliette; Forster, Peter; Lynnerup, Niels; Bandelt, Hans-Jürgen; Nørby, Søren (септембар 2000). „mtDNA Variation among Greenland Eskimos: The Edge of the Beringian Expansion”. American Journal of Human Genetics. 67 (3): 718—726. PMC1287530. PMID10924403. doi:10.1086/303038. „The relatively lower coalescence time of the entire haplogroup A2 including the shared sub-arctic branches A2b (Siberians and Inuit) and A2a (Eskimos and Na-Dené) is probably due to secondary expansions of haplogroup A2 from the Beringia area, which would have averaged the overall internal variation of haplogroup A2 in North America.”CS1 одржавање: Формат датума (веза)
Tymchuk, Wendy (2008). „Learn about Y-DNA Haplogroup Q-M242”. Genebase Systems. Архивирано из оригинала 22. 6. 2010. г. „Haplogroups are defined by unique mutation events such as single nucleotide polymorphisms, or SNPs. These SNPs mark the branch of a haplogroup, and indicate that all descendants of that haplogroup at one time shared a common ancestor. The Y-DNA SNP mutations were passed from father to son over thousands of years. Over time, additional SNPs occur within a haplogroup, leading to new lineages. These new lineages are considered subclades of the haplogroup. Each time a new mutation occurs, there is a new branch in the haplogroup, and therefore a new subclade. Haplogroup Q, possibly the youngest of the 20 Y-chromosome haplogroups, originated with the SNP mutation M242 in a man from Haplogroup P that likely lived in Siberia approximately 15,000 to 20,000 years before present”CS1 одржавање: Формат датума (веза)
Viegas, Jennifer. „First Americans Endured 20,000-Year Layover”. Discovery News. Архивирано из оригинала 13. 3. 2012. г. „Archaeological evidence, in fact, recognizes that people started to leave Beringia for the New World around 40,000 years ago, but rapid expansion into North America didn't occur until about 15,000 years ago, when the ice had literally broken”CS1 одржавање: Формат датума (веза)