A book that is very helpful for the more conservatively inclined, or
"evangelicals", is George Eldon Ladd, THE NEW TESTAMENT AND CRITICISM,
Eerdmans, 1967. It's a bit outdated, naturally, but very pedagogical for
those who might tend to resist anything that came with the word
"Criticism". We have it in Spanish also, and it has really been an
exciting experience and eye-opener for our students down here. Juan