Bernal, M. S. M. (2013). Productivity and competitiveness determination of the small-scale mining at the northern mining district in the state of Boyacá. Universidad Pedagógica y Tecnológica de Colombia.
Citace podle Chicago (17th ed.)Bernal, Martha Stella Martínez. Productivity and Competitiveness Determination of the Small-scale Mining at the Northern Mining District in the State of Boyacá. Universidad Pedagógica y Tecnológica de Colombia, 2013.
Citace podle MLA (9th ed.)Bernal, Martha Stella Martínez. Productivity and Competitiveness Determination of the Small-scale Mining at the Northern Mining District in the State of Boyacá. Universidad Pedagógica y Tecnológica de Colombia, 2013.
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