López Camelo, Andrés F. (2004). Manual for the Preparation and Sale of Fruits and Vegetables. Food and Agriculture Organization of the United Nations. p. 6. ISBN92-5-104991-2. Consultado el 31 de julio de 2009. «However, in the case of potatoes (Figure 10), sweet potatoes, and other root vegetables, readiness for harvest is based on the percentage of tubers of a specific size.» Potatoes are technically tubers, not roots, and sweet potatoes are tuberous roots.
