Gomez-Casado, Eduardo, Jorge Martinez-Laso, Juan Moscoso del Prado Ucelay, Joseph Zamora, José M. Martin-Villa, Mercedes Perez-Blas, Mercedes Lopez-Santalla, P. Lucas Gramajo, Carlos Silvera, Ernesto Lowy, and Antonio Arnaiz-Villena. "Origin of Mayans according to HLA genes and the uniqueness of Amerindians." Research Gate. Last modified July 2003. Accessed October 2, 2021. https://www.researchgate.net/figure/Map-showing-the-geographic-location-of-the-Mayan-population-studied-and-Mayan-languages_fig1_10693028.

Gomez-Casado, Eduardo, Jorge Martinez-Laso, Juan Moscoso del Prado Ucelay, Joseph Zamora, José M. Martin-Villa, Mercedes Perez-Blas, Mercedes Lopez-Santalla, P. Lucas Gramajo, Carlos Silvera, Ernesto Lowy, and Antonio Arnaiz-Villena. "Origin of Mayans according to HLA genes and the uniqueness of Amerindians." Research Gate. Last modified July 2003. Accessed October 2, 2021. https://www.researchgate.net/figure/Map-showing-the-geographic-location-of-the-Mayan-population-studied-and-Mayan-languages_fig1_10693028.