Оригинал: Three R's for Snare Drum, Volume 1. Acton E. Ostling. Percussion sheet music. Three R's for Snare Drum, Volume 1. Reading. Rhythms.
Превод: Three R за Snare Drum, том 1. Acton E. Östling. Percussion нотни листове. Three R за Snare Drum, том 1. Четене. Ритми. Елементарни познания.