fuentes - imágenes:​

1.  Reciclajes. (2016). Flickr. Recuperado el 7 October 2016, from https://www.flickr.com/photos/javiolano/4137332967/ botellas de vidrio

2. Madera (2016). Flickr. Recuperado el 9 October 2016, from https://www.flickr.com/photos/10209472@N03/1334756133/in/photolist-fvhVVp-9uEXZG-9djmRA-9uCQyB-9uFuJN-pGuvGy-cJmTLG-79APqr-32WYuM-9uF8gq-ekCx4C-9uFnFE-9uFNQS-ekwMoF-9uG1jm-ekCx7m-9uCant-86DVZx-7fQrtW-4xB8KV

3. Junta Accionistas. (2016). Flickr. Recuperado el 9 October 2016, from https://www.flickr.com/photos/codelco/17116025678/in/photolist-s5u781-qsSh2M-m4Nyzc-pvSTSJ-9d36qX-8C5Pzg-88DfLT-9d36mv-8KH5kL-dLd5qi-cnPaK7-e3a9EX-bqhbXX-bC9JH5-7zeZfn-7dqd6R-7jfrAX-9NFDsf-a5X8L2-e56C9z-cnP9AE-9oKgJX-9NCQKa-7ZdE7o-8NwRNR-8NwRM2-8NwRJ2-8NzWKA-8NwRwk-8RXG8Q-rQUo5M-afmsXk-kdyK8D-9wfrR7-noULrN-8gbkkW-9GMQjr-sntiL5-ofij7P-snApnR-9H2cuV-s63mYQ-9H2AK4-a7bKyG-9H29Zc-8kmpNH-skkGQJ-8NzX2W-e3fPsy-8NzX4q

4. reciclaje urbano. (2016). Flickr. Recuperado el 9 October 2016, from https://www.flickr.com/photos/carlosfpardo/8180622156/in/photolist-dsTPXA-prDD9D-cc1DT-4H2iwk-jWhN7-3acMB1-2ZZuJk-29ipz-7Z4buu-8FxL3-pJH9DE-cCcURQ-asXZyw-4xcmcS-5oQQRU-78PD8C-asXZth-7466ao-78KYUc-dJnw94-78PMxo-cA6GJf-dLgcKa-maavUw-5hvUZb-asVngk-7kZdVh-5SbcNy-evgtm3-asXZBq-78PHG1-7KTf3y-73yV8S-9si8yM-fsWRe-bCVcjd-9fxGj2-6wtJAb-ogmduH-qAUP-6a61Rg-7kZdUW-aEBcJA-6eEshd-7kZdV1-NxKVs-5XhFyh-5q77Kc-9JQLsT-7R9cWv

5. Botellas plásticas.. (2016). Flickr. Recuperado el 9 October 2016, from https://www.flickr.com/photos/matt_hintsa/2857673802/

6. Edificio e - Universidad de La Sabana, imagen recuperada el 9 October 2016 de Google maps: https://www.google.es/maps