International Conference of Specialists of Socialist Countries in the Building, Installation, and Equipment of Libraries 3d Sofia 1968.

• Sbornik ot materiali na Tretoto mezhdunarodno sŭveshtanie na spet͡s︡ialistite ot evropeĭskite sot͡s︡ialisticheski strani po vŭprosite na stroitelstvoto, obzavezhdaneto i mekhanizat͡s︡ii͡a︡ta na bibliotekite, sŭstoi͡a︡lo se ot 16 do 20 sept. 1968 g