  We consider various classes of persistent extragalactic astrophysical sources
which have been suggested in literature as possible emitters of
ultra-high-energy cosmic rays (UHECR). We compare the strength of the claimed
correlations by a uniform procedure for all classes of sources by making use of
the AGASA, Yakutsk and HiRes stereo data. BL Lac type objects correlate with
the cosmic rays detected by all three independent experiments and are more
probably, compared to other astrophysical sources, related to the UHECR origin.
With the account of the Galactic magnetic field (not possible for the HiRes
data at the moment), apart of BL Lac type objects, unidentified gamma-ray
sources may be correlated with AGASA and Yakutsk cosmic rays.
