There are at over forty authors, nine of whom were secular, who mentioned Jesus within 150 years of his death. Scholar Gary Habermas, in his Book "The Case for the Resurrection of Jesus" (p.233), listed the following: "9 authors from the New Testament - Matthew, Mark, Luke, John, Paul, Author of of Hebrews, James, Peter, and Jude. 21 early Christian writers outside the NT - Clement of Rome, Ignatius, Polycarp, Martyrdom of Polycarp, Didache, Barnabus, Shepherd of Hermas, Fragments of Papias, Justin Martyr, Aristides, Athenagoras, Theophious of Antioch, Quadratus, Aristo of Pella, Melito of Sardis, Diognetus, Gospel of Peter, Apocalypse of Peter, and Epistula Apostolorum. 4 heretical writings - Gospel of Thomas, Gospel of Truth, Apocryphon of John, Treatise on Resurrection. And 9 secular non-Christian sources, including Josephus, Tacticus, Pliny the Younger, Phlegon, Lucian, Celcus, Mara Bar-Serapion, Seutonius, and Thallus."
I just had a huge long debate with another Christian about this in another thread, so I'm not going to go through the whole song and dance again this soon. I'll simply say, all those sources are secondary at best, excepting Paul whose belief in Jesus came from alleged direct revelation/vision, not any earthly interaction with Jesus or anyone else, per his own testimony. Josephus' references are widely known to be later Christian interpolations, not original to him.