Constitution on the Sacred Liturgy : Sacrosanctum Concilium (CSL)
Document of Vatican II, see Pauline Books & Media, or the Publishers listing for Canadian orders.

New Introductions to the Sacramentary and Lectionary
Contains GIRM (General Instructions Roman Missal), Introduction to the Lectionary for Mass. Publisher: Canadian Conference of Catholic Bishops (CCCB).

The Basic Sixteen Documents of Vatican Council II
Constitutions- Decrees- Declarations. General Editor: Austin Flannery, Costello Publishing Co.

The Liturgy Documents: A Parish Resource, Volume 1
Third edition, Liturgy Training Publications (LTP). Includes Constitution on the Sacred Liturgy (CSL), General Instructions Roman Missal (GIRM), Lectionary for Mass (Introductions), General Norms of the Liturgical Year (GNLY), Directory for Masses with children.

The Vatican Collection: Vatican II, Volume 2
More Post-Concilar Documents, New revised Edition. General Editor: Austin Flannery, Costello Publishing Co. Includes Musicam Sacram: Instructions on Music in the Liturgy