Since 29 September, to support and guide the management of its collection, the Library has adopted a new persistent identifier policy. A persistent identifier or PID is a long lasting digital reference to an entity whether it is physical or digital. PIDs are a core component in providing reliable, long-term access to collections and improve their discoverability.
M. Variščić. Udruženje za zaštitu okoline Zeleni - Neretva ; Fondacija Heinrich Böll, Regionalni ured Sarajevo, Konjic ; Sarajevo, Third edition, (2011)