Bolívar-León, R., Triviño-Jaimes, N. R., & García-Mogollón, J. M. (2014). A Technical and Environmental Study of Fortified Structures Used in Coal Mining in Norte de Santander. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Bolívar-León, Rafael, Neyl Richard Triviño-Jaimes, i Javier Mauricio García-Mogollón. A Technical and Environmental Study of Fortified Structures Used in Coal Mining in Norte De Santander. Universidad Pedagógica y Tecnológica de Colombia, 2014.
MLA način citiranja (9. izdanje)Bolívar-León, Rafael, et al. A Technical and Environmental Study of Fortified Structures Used in Coal Mining in Norte De Santander. Universidad Pedagógica y Tecnológica de Colombia, 2014.
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