| Main Author | Title | Date | Category | Format |
|---|---|---|---|---|
| Alker, Hugo | Blockflöten-Bibliographie | 1984, c1985 | Repertory Guide--Recorder | Book |
| Alker, Hugo | Blockflöten-Bibliographie | 1961 | Repertory Guide--Recorder | Book |
| Alker, Hugo | Blockflöten-Bibliographie | 1966 | Repertory Guide--Recorder | Book |