https://psebooks.club/book/200658760-geopolitica-umana-capire-il-mondo-dalle-civilt-antiche-alle-potenze-od&from_srp=true&qid=XFKVlSL8Qa&rank=1
https://psebooks.club/book/200658760-geopolitica-umana-capire-il-mondo-dalle-civilt-antiche-alle-potenze-od&from_srp=true&qid=RbgoKLqdOQ&rank=1
https://ug.annas-archive.org/md5/df801976ba98e5d5c55f1b95a8fcd152