Hartley, W. S. (1975). Three modes for piano. Piedmont Music.
Lua i Stíl Chicago (17ú heag.)Hartley, Walter Sinclair. Three Modes for Piano. [s.l.]: Piedmont Music, 1975.
Lua MLA (9ú heag.)Hartley, Walter Sinclair. Three Modes for Piano. Piedmont Music, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.