| Title | Helteja (smaragdno srce) |
| Alternate title | |
| Subtitle | opera. Opereta v treh dejanjih, napisal P Greserov (Gočovin). Režiser O. Šest |
| Author | |
| Corporate author | Narodno gledališče (Ljubljana) |
| Year of publication | 1938 |
| Place of publication | Ljubljana |
| Publisher | Narodno gledališče |
| Source | |
| Signature | 66-350-584 |