I recently came across the most helpful resources on the historical backgrounds to the Gospels that I have ever seen. It is called Jesus in Context: Background Readings for Gospel Study by Darrell Bock. This book works through the synoptics and John and pulls just about any relevant extra-biblical text in full quotation to help you see what other ancient writers said about a topic, a city, a custom, etc. Reading the geneaology of Jesus? Look and see how other ancient Jewish writers did genealogies. Studying Jesus’ turning water to wine at Cana? You go to that miracle in this book and it first gives you a bit of historical background on eschatology and wine followed by relevant quotations from 1 Enoch, 2 Baruch, Tobit, and the Talmud on wine and quotations from Josephus on Cana. Combine the content with Logos Bible software and you have an unbelievably powerful resource for your studies. This book concludes with multiple indices that include index by topic, by scripture, by extra-biblical reference and a huge list for further reading broken down by topic, If you are a student of the Gospels and want extra-biblical references all in one place this is the book for you. If you would use Logos and would like to have it at your disposal in a fully searchable, indexed format with clickable links with full references for you to use in your study or writing, you can get it here.