Double Stop Beginnings for Violin, Book One - C. HARVEY PUBLICATIONS
HAL LEONARD Trott, Josephine: Melodious Double Stops Bk.1 (viola) - Metzler Violin Shop
3 Steps to Practice Double Stops on the Violin or Viola | Violin Lounge TV #225 - YouTube
Vibrato and Double Stops in Bach's Chaconne (major part) | Violin Lounge TV #412 - Violin Lounge
Amazon.com: Josephine Trott - Melodious Double-Stops, Book I: transcribed for viola by Jane Daniel: 0073999851878: Daniel, Jane, Trott, Josephine: Books
D.C. Dounis The Technique Of Double Stop - Selected Exercises From Op. 12 & 29 - Arranged For Viola By Demetrius Constantine Dounis - Digital Sheet Music For Individual Part - Download
The Beginners Guide to Violin Double-stopping - 8notes.com