^Holmer, Rick. The Aztec Book of Destiny. North Charleston, South Carolina: BookSurge LLC. 2005: 83 [2017-10-22]. ISBN 9781419611636(英语). The provider of the Shadow Coul Tonalli for those born on Grass Malinalli is the Medicine God Patecatl who symbolizes the health and healing effects of medicinal herbs that grow from the "jaws of earth".