Ward, S. D. (1937). String Bass: A fundamental course for individual or like-instrument class instruction / Sylvan D. Ward. Rubank.
Lua i Stíl Chicago (17ú heag.)Ward, Sylvan D. String Bass: A Fundamental Course for Individual or Like-instrument Class Instruction / Sylvan D. Ward. Miami, Fl.: Rubank, 1937.
Lua MLA (8ú heag.)Ward, Sylvan D. String Bass: A Fundamental Course for Individual or Like-instrument Class Instruction / Sylvan D. Ward. Rubank, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.