El nuevo calendario litúrgico. Italian, 1974 t.p. (Alessandro Olivar) p. 4 of cover (monk of the Abbey of Montserrat; secretary of the Societat Catalana d'Estudia Litúrgics)
LC manual auth. cd. (Olivar, Alexandre)
Peter, Chrysologus, Saint, Archbishop of Ravenna. Sancti Petri Chrysologi Collectio sermonum ... 1982 v. 3, t.p. (Alexandri Olivar)