González-Sierra, M. A., & Lara-González, L. Á. (2014). Diagnosis of accidents in the small and medium mining of Boyacá. Universidad Pedagógica y Tecnológica de Colombia - UPTC.
Chicago Style (17. basım) AtıfGonzález-Sierra, Miguel Alfonso, ve Luis Ángel Lara-González. Diagnosis of Accidents in the Small and Medium Mining of Boyacá. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2014.
MLA (9th ed.) AtıfGonzález-Sierra, Miguel Alfonso, ve Luis Ángel Lara-González. Diagnosis of Accidents in the Small and Medium Mining of Boyacá. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2014.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..