Luis A. Rueda, Carla P. Ariza, Raul J. Martelo
      Ecological marketing applied by companies that develop coal mining in La Guajira, Venezuela
      Contemporary Engineering Sciences, Vol. 11, 2018, no. 44, 2157-2162
      https://doi.org/10.12988/ces.2018.85225

Copyright © 2018 Luis A. Rueda, Carla P. Ariza and Raul J. Martelo. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.