| Title | Političeski krug "Zveno" |
| Alternate title | |
| Subtitle | Ustav'' |
| Author | |
| Corporate author | Političeski krug "Zveno" (Sofija) |
| Year of publication | 1931 |
| Place of publication | Sofija |
| Publisher | Političeski krug "Zveno" |
| Source | |
| Signature | 14-28-74-401; 14-28-76-1119 |