Original: Mathews, William Smythe Babcock. Standard Graded Course of Studies for the Pianoforte. Mathews, William Smythe Babcock. Piano solo.
Traducció: Mathews, Guillermo Smythe Babcock. Mathews, Guillermo Smythe Babcock. Piano sol. Volume 1. Volume 2. Volume 3. Volum 4.