Originalus: The Clippinger Class-Method of Voice Culture. Edited by Frank Damrosch, W.A.F., Granville Bantock, Heinrich Kiehl, Ebenezer Prout.
Vertimas: Clippinger Klasės metodas Voice kultūros. Redagavo Frank Damrosch, WAF, Granville Bantock Henry Kiehl, Ebenezer Prout. Balso natos.