Rzedowski, J., Calderón de Rzedowski, G., & Zamudio, S. (2012). The vascular plants endemic in the state of Queretaro. I. Preliminary numerical analysis and definition of areas of concentration of the restricted-range species. Instituto de Ecología, A.C.

Rzedowski, Jerzy, Graciela Calderón de Rzedowski, and Sergio Zamudio. The Vascular Plants Endemic in the State of Queretaro. I. Preliminary Numerical Analysis and Definition of Areas of Concentration of the Restricted-range Species. Instituto de Ecología, A.C, 2012.

Rzedowski, Jerzy, et al. The Vascular Plants Endemic in the State of Queretaro. I. Preliminary Numerical Analysis and Definition of Areas of Concentration of the Restricted-range Species. Instituto de Ecología, A.C, 2012.