Espinosa-Rodríguez, L. M. (2017). Geopark in Tlalpujahua-El Oro Mining District. Universidad Autónoma de Tamaulipas.
Čikaški stil citiranja (17. izdanje)Espinosa-Rodríguez, Luis Miguel. Geopark in Tlalpujahua-El Oro Mining District. Universidad Autónoma de Tamaulipas, 2017.
MLA način citiranja (8. izdanje)Espinosa-Rodríguez, Luis Miguel. Geopark in Tlalpujahua-El Oro Mining District. Universidad Autónoma de Tamaulipas, 2017.
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