Officially, the provides one liturgical book, "The Orthodox Missal", which contains both the Liturgy of Saint Tikhon and the Liturgy of Saint Gregory, with appropriate propers for seasons, feasts, saints, and prayers before and after Mass. The Antiochian Archdiocese publishes the "Saint Andrew Service Book" (SASB), also known as "The Western Rite Service Book", which was developed by Saint Michael's Church in California under the leadership of the late Father Michael Trigg; the 1996 second and 2005 third editions of the SASB received official sanction from Metropolitan Philip Saliba, with the latter containing explicit reference to the authorized nature of all previous editions of the SASB. In addition to duplicating the contents of "The Orthodox Missal", the SASB also includes forms for Matins and Vespers, the Benediction of the Blessed Sacrament, and the threefold Amen common to the Byzantine epiclesis but absent in "The Orthodox Missal". The SASB was produced by the Antiochian Archdiocese without the participation of the . "The Orthodox Missal" is an official publication of the and is the Vicariate's standard and approved text with the SASB authorized by the Archdiocese as an approved text.