Second Crusade
Supplemental Resources
Constable, Giles. "The Second Crusade as Seen by Contemporaries," Traditio, 9 (1953) pp. 213 ff.
The main primary source for the Second Crusade is Odo of Deuil, De profectione Ludovici VII in orientem, edited and translated by V.G. Berry, 1948. An older translation is available on-line at Odo of Deuil: The Crusade of Louis VII
There is no work specifically on the Second Crusade, so just read the relevant pages in Mayer, Riley-Smith, Runciman, and/or Setton.
There are, however, some primary sources available, mainly at the Medieval Internet Sourcebook:
William of Tyre: The Fall of Edessa
Eugenius III: Call for Second Crusade, Dec. 1, 1146
William of Tyre: The Fiasco at Damascus
Annales Herbipolenses, s.a. 1147: A Hostile View of the Crusade
St. Bernard of Clairvaux (1090-1153): Apologia for the Second Crusade