Online Reference Book for Medieval Studies
Orb: The Second Crusade, Rome 1145
A thorough chronology of the Second Crusade, from inception to defeat.
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: Summons to a Crusade
Fordham University gives the text of Eugene III's letter to Louis, King of France, calling for a crusade (the second) to recapture land from the Muslims.
University of Michigan
University of Michigan: Second Crusade (1147 1149)
A summary of the Second Crusade and the events that followed.
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: St. Bernard
This site, which is provided for by the Medieval Sourcebook of Fordham University, gives St. Bernard's written defense of the Second Crusade, in spite of its failure.