These are websites links where you can find essential official Church documents as well as other helpful publications. This is not an all-inclusive list.

• All the Documents of the Second Vatican Council Located at Christusrex.org
• Constitution on the Sacred Liturgy Sacrosanctum Concilium, 4 December, 1963   Located at Christusrex.org
• Musicam sacram (1967) Instruction on Music in the Liturgy  Located at EWTN
• Pius XII: Musicae Sacre (1955) On Sacred Music  Located at EWTN
• Documents of the Catholic Church  Located at Spring Hill College
• Reading the Liturgical Documents Modern Liturgy, Sept. 1996
• US Bishops’ Committee on the Liturgy (BCL)