Áèáëèîãðàôèÿ
„Ãàëèëåé è âñåëåíàòà” – Ñòèâ Ïàðêúð
„Àáàãàð Õîëäèíã” ÎÎÄ è Áåëàéòà Ïðåñ, 199393
http://wikipedia.org
http://www.lettherebenight.com/galileo.html
http://www.astro.umontreal.ca/~paulchar/sp/images/3letters.html
http://galileo.rice.edu/sci/instruments/balance.html
http://www.orbit.zkm.de/?q=node/194