| LDR | | b n c z d + e + f n g + h +4500 |
| 001 | | a a23464227 |
| 008 | | a 091015n!!aznnnaabn++++++++++!a+aaa++++!+ |
| 010 | | a p 2016057829 |
| 040 | | a WA N c WA N |
| 100 | 1. | a Beron, Pet"r d (1940- ) |
| 400 | 1. | a Beron, Petàr d (1940- ) |
| 667 | | a osobowe |
| 670 | | a La baguage des chauves-souris en Bulgarie de 1940 à 1961 / Petàr Beron. - Białowieża ; Warszawa, 1963. |
| 670 | | a LCA online |