Rickards, O., Martínez-Labarga, C., Lum, J. K., De Stefano, G. F., & Cann, R. L. (1999). mtDNA history of the Cayapa Amerinds of Ecuador: Detection of additional founding lineages for the Native American populations.

Rickards, O., C. Martínez-Labarga, J K. Lum, G F. De Stefano, ja R L. Cann. MtDNA History of the Cayapa Amerinds of Ecuador: Detection of Additional Founding Lineages for the Native American Populations. 1999.

Rickards, O., et al. MtDNA History of the Cayapa Amerinds of Ecuador: Detection of Additional Founding Lineages for the Native American Populations. 1999.