Tacitus. Josephus. Pliny the Younger. Scipio. The Jewish Mishnah. One other name that will drive me nuts until it occurs to me, or I get home to my materials.
If you believe that Julius Ceaser was assasinated in the Roman Senate March 15, 44 B.C. on three sources, it is intellectually dishonest to doubt Jesus' resurrection on 6 ancient exo Biblical references.
It's more realistic to believe someone was murdered, than it is to believe someone came back from the dead.