Gamm, D. B. (1976). On cloud nine: 24 model liturgies and 4 penance services for grades one through four, thematically arranged for the school year with emphasis on the liturgical seasons. Ave Maria Press.

Gamm, David B. On Cloud Nine: 24 Model Liturgies and 4 Penance Services for Grades One Through Four, Thematically Arranged for the School Year with Emphasis on the Liturgical Seasons. Notre Dame, Ind.: Ave Maria Press, 1976.

Gamm, David B. On Cloud Nine: 24 Model Liturgies and 4 Penance Services for Grades One Through Four, Thematically Arranged for the School Year with Emphasis on the Liturgical Seasons. Ave Maria Press, 1976.