Velazco Macías C. G., Alvarado Vázquez M. A., Arias Montes S., A new species of Aztekium (Cactaceae) from Nuevo León, México, Xerophilia, 2013, (Special Issue 2):13-20
The protologue of Aztekium valdezii. It compares stem and seed morphology with the other species in the genus.