Autore:William Wallace Campbell

William Wallace

Campbell astronomo statunitense

  1. 1,0 1,1 data.bnf.fr
  2. 2,0 2,1 Encyclopædia Britannica
  3. 3,0 3,1 SNAC
  4. 4,0 4,1 Brockhaus Enzyklopädie
  5. Proleksis enciklopedija
  6. Grande Enciclopedia Sovietica 1969–1978