Linguistic tone is related to the population frequency of the adaptive haplogroups of two brain size genes, ASPM and Microcephalin.

MLA

Dediu, Dan, and D.Robert Ladd. “Linguistic Tone Is Related to the Population Frequency of the Adaptive Haplogroups of Two Brain Size Genes, ASPM and Microcephalin.” Proceedings of the National Academy of Sciences of the United States of America, vol. 104, no. 26, June 2007, pp. 10944–49. EBSCOhost, https://doi.org/10.1073/pnas.0610848104.

APA

Dediu, D., & Ladd, D. R. (2007). Linguistic tone is related to the population frequency of the adaptive haplogroups of two brain size genes, ASPM and Microcephalin. Proceedings of the National Academy of Sciences of the United States of America, 104(26), 10944–10949. https://doi.org/10.1073/pnas.0610848104

Chicago

Dediu, Dan, and D. Robert Ladd. 2007. “Linguistic Tone Is Related to the Population Frequency of the Adaptive Haplogroups of Two Brain Size Genes, ASPM and Microcephalin.” Proceedings of the National Academy of Sciences of the United States of America 104 (26): 10944–49. doi:10.1073/pnas.0610848104.