1. The peanut (Arachis hypogea) - its history, histology, physiology and utility;Waldron;Penn Univ Bot Lab Contrib,1919
2. Preceramic adoption of peanut, squash, and cotton in northern Peru;Dillehay;Science,2007
3. Primeras parte de los Commentarios Reales 1609, translated CR Markham;Garsilaso de la Vega,1871
4. De Oviedo y Valdes GF. La historia general de la Indias. Seville (Spain);1535.