Oorspronklik: A World of Happiness. A World of Happiness composed by Tor Hyams, David Scharff, Dr. Denise Hyams, Ph.D.. Classroom. Pre-School.
Vertaling: Klaskamer. Algemene Musiek en klaskamer Publications. Ander Klaskamer. Book. Gepubliseer deur Alfred Musiek. AP.30721.