The Evidence for Jesus considers non-Christian evidence, pagan and Jewish, and concludes that there is very little which has any claim to be independent or unbiased. A discussion of Christian sources outside the New Testament - especially the apocryphal gospels - yields a similar result.
R. T. France contends that the primary evidence is that of the canonical gospels. Their adequacy and reliability as sources of historical information are discussed at some length, establishing that they do give us a firm foundation for our knowledge of Jesus.