
https://www.project-syndicate.org/commentary/trump-spurs-european-defense-integration-by-joseph-s–nye-2017-07

https://www.project-syndicate.org/commentary/putin-trump-g20-meeting-by-nina-l–khrushcheva-2017-07

https://theconversation.com/por-que-colombia-ve-la-legalizacion-de-las-drogas-como-el-camino-a-seguir-221423