Bugnini, Annibale, (1990) The Reform of the Liturgy 1948–1975. The Liturgical Press Dix, Dom Gregory (1945) The Shape of the Liturgy Donghi, Antonio, (2009) Words and Gestures in the Liturgy. The Liturgical Press Johnson, Lawrence J., (2009) Worship in the Early Church: an Anthology of Historical Sources.