1. Brieger, F. G., J. T. A. Gurgel, E. Paterniani, A. Blumenschein, and M. R. Alleoni. 1958. Races of maize in Brazil and other eastern South American countries. Publication 593. National Academy of Sciences/National Research Council, Washington, DC.
2. Brücher, H. 1969. Gibt es gen-zentren? Naturwissenschaften 56:77–84.
3. — 1990. Difusión transamericana de vegetales útiles del neotrópico en la época pre-colombina. Pages 265–283in D. A. Posey, and W. L. Overal, eds., EthnoBiology: implications and applications. Proceedings of the First International Congress of EthnoBiology. Museu Paraense Emílio Goeldi/ CNPq/SCT, Belém, PA, Brazil.
4. de Candolle, A. 1882/1908. Origin of cultivated plants. D. Appleton, New York.
5. Clement, C. R. 1988. Domestication of the pejibaye palm(Bactris gasipaes): past and present. Pages 155–174in M. J. Balick, ed., The palm—tree of life. Advances in Economic Botany 6. New York Botanical Garden, New York.