1. Sequence and organization of the human mitochondrial genome;Anderson;Nature,1981
2. Founder mitochondrial haplotypes in Amerindian populations;Bailliet;Am J Hum Genet,1994
3. Microevolution in lower Central America: genetic characterization of the Chibcha-speaking groups of Costa Rica and Panama, and a consensus taxonomy based on genetic and linguistic affinity;Barrantes;Am J Hum Genet,1990
4. The Cayapa Indians of Ecuador, Indian notes and monographs 40;Barrett,1925
5. Cayapas o Chachis. Vol 4: Etnologia ecuatoriana. Graficas Duque;Barriga-Lopez,1987