Oryginalny tekst: Strings Magazine May 2015. Strings Magazine May 2015 strings Magazine. 74 pages. Published by Hal Leonard. HL.77771996.
Tłumaczenie: 74 stron. Opublikowane przez Hal Leonard. Strings – May 2015 Cover Stories. The Calder Quartet. Kronos Quartet Invests in NYC Youth Groups.