From Violin to Viola. (A Transitional Method). By Harvey S. Whistler. String Method. 48 pages. Rubank Publications #RUBL132. Published by Rubank Publications
String Companions, Volume 2 (Violin and Viola Duet Collection Published in Score Form). Arranged by Herman Hummel and Harvey S. Whistler. Ensemble Collection. Grade 3-4. 32 pages. Rubank Publications #RUBL170. Published by Rubank Publications