Oriģināls: One Minute Theory. For The Choral Musc Classroom. Ronald Slabbinck. Voice sheet music. One Minute Theory. Edited by Holly Slabbinck.
Tulkojums: One Minute teorija. Par kora Musc klasē. Balss notis. One Minute teorija. Korim. balss. One Minute Series. Mācību un General Theory.
