Cita APA (7th ed.)

Hernandez, H. M., & Godinez A., H. (1994). Contribution to the knowledge of threatened Mexican cacti. Instituto de Ecología, A.C.

Cita Chicago (17th ed.)

Hernandez, Hector M., i Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.

Cita MLA (9th ed.)

Hernandez, Hector M., i Hector Godinez A. Contribution to the Knowledge of Threatened Mexican Cacti. Instituto de Ecología, A.C, 1994.