1. Abulafia D.(2015). Britain: Apart from or a part of Europe.History Today. Retrieved fromhttp://www.historytoday.com/david-abulafia/britain-apart-or-part-europe
2. Corrêa da Serra;Agan J. E.;Boletim da Sociedade Broteriana,1926
3. Andress D. Blakemore R. Charlton T. Gregor N. Moss R. Nowakowska N. …Williams M.(2015). Fog in Channel Historians Isolated.History Today. Retrieved fromhttp://www.historytoday.com/various-authors/fog-channel-historians-isolated#sthash.1P7Bb8N7.dpuf
4. Globalization
5. The Spread of Western Science