Gamba, G. P., López, H. J. F., & Contreras, L. E. (2013). Effects of foreign investment in Colombian mining and four countries in the region. Universidad Pedagógica y Tecnológica de Colombia.
Chicago-viite (17. p.)Gamba, Gloria Patricia, Héctor Javier Fuentes López, ja Leonardo Emiro Contreras. Effects of Foreign Investment in Colombian Mining and Four Countries in the Region. Universidad Pedagógica y Tecnológica de Colombia, 2013.
MLA-viite (9. p.)Gamba, Gloria Patricia, et al. Effects of Foreign Investment in Colombian Mining and Four Countries in the Region. Universidad Pedagógica y Tecnológica de Colombia, 2013.
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