Blue-white subgiants
Delta Scorpii still showing off ( Sky and Telescope, June 25, 2003)
Sky and Telescope - The Essential Magazine of Astronomy
Delta Scorpii brighter than ever ( Sky and Telescope, February 4, 2002)
Sky and Telescope - The Essential Magazine of Astronomy
Dschubba sow
Dscubba
Bright star Catalogue alcyone sit
The Bright Star Catalogue
Tables of past and future eclipses of bright stars by the inner planets. (German).
Astrospica , an astronomical image gallery named for Spica. (Spanish)
Astrospica.com
Spika , the first Slovene astronomical magazine, edited by Bojan Kambič and published since 1995 (Slovene)
Spika
Evergreen froola!!! Blue-white_subgiants
Lesath article on Jim Kaler's Stars website
Lesath
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It uses material from the Wikipedia articles :
Delta Scorpii , Rigel , Spica , Upsilon Scorpii , .
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the Froola link list about "Blue-white subgiants".