Hernandez, H. M., & Godinez A., H. (1994). Contribution to the knowledge of threatened Mexican cacti. Instituto de Ecología, A.C.
Citace podle Chicago (17th ed.)Hernandez, Hector M., a Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.
Citace podle MLA (9th ed.)Hernandez, Hector M., a Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.