The official website of European astrological historian and archivist Philip M. Graves – https://www.astrolearn.com/astrology-articles/
Deborah Houlding – http://www.skyscript.co.uk
Filmliste – https://www.youtube.com/playlist?list=PLWfUcScvQbEy4Xcm2Xq9Ln8PKFK0i_Wna