Hernandez, H. M., & Godinez A., H. (1994). Contribution to the knowledge of threatened Mexican cacti. Instituto de Ecología, A.C.
Style de citation Chicago (17e éd.)Hernandez, Hector M., et Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.
Style de citation MLA (9e éd.)Hernandez, Hector M., et Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.