Hurrell, C. E. (1968). The horn of Heimdall: For French horn (in F) with piano accompaniment. Rubank.
Chicago-referens (17:e uppl.)Hurrell, Clarence E. The Horn of Heimdall: For French Horn (in F) with Piano Accompaniment. Chicago: Rubank, 1968.
MLA-referens (9:e uppl.)Hurrell, Clarence E. The Horn of Heimdall: For French Horn (in F) with Piano Accompaniment. Rubank, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.