Ramos, Maria Cristina, Roman Petruk, Vitalii Ishchenko, і Galyna Petruk. 2017. «SOURCES OF ENVIRONMENTAL THREATS IN EL-ORO PROVINCE (ECUADOR)». Scientific Works of Vinnytsia National Technical University, вип. 1 (Липень):1-6. https://works.vntu.edu.ua/index.php/works/article/view/494.