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Izvornik
Schildkrote. Willy Burkhard. Choir sheet music. Schildkrote composed by Willy Burkhard. 1900-1955. For Men's choir. Choral. Published by Hug Musikverlage. HG.GH-7119. ISBN M-2028-1409-3. choral.
Prijevod
Schildkrote. Willy Burkhard. Zbor note. Schildkrote sastoji Willy Burkhard. 1900-1955. Za Muška zbor. Horski. Objavio zagrljaj Musikverlage. HG.GH-7119. ISBN M-2028-1409-3. horski.