Moravek Endre: Index acronymorum selectorum. Pars 7. Instituta communicationis (A MTAK kiadványai 47. Budapest, 1966)

Y Y & MV RR YHA YHANI YLE Y.S. YTC Yugopress Yazoo and Mississippi Valley Railroad, /US/ /е/ Youth Hostels Association /England and Wales/, S Albans /е/ Youth Hostels Association of Northern Ireland, Belfast /е/ Yleisradio, H /suo/ Youngstown and Southern Railroad Company, /US/ /е/ Youth Travel Club, /GB/ /е/ Yugoslav Press, Beograd /е/