Raya Yusrizal Saddam Muhammad, Atik Purmiyati,. «Impact of Distance, Exchange Rate, Population, and GDP on Natural Rubber Export». Opción 36, no. 91 (abril 28, 2020): 124-138. Accedido agosto 1, 2025. https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/31840.