Tullock assumes the validity of the documentary hypothesis (as developed by Wellhausen et al.) and proceeds from there, which is a fatal flaw for two reasons: 1)The introductory student probably doesn't care about theories of composition and would be better served by spending more time becoming acquainted with the content and themes of the OT books; 2)Wellhausen's theories are deeply flawed, as many authors in the past century have pointed out (as an example, see Kline's Structure of Biblical Authority, which makes a compelling case that the form of Deuteronomy is that of an ancient treaty and only fits the milieu of the Mosaic period).

Skip this one.

Note: the above comments apply to the edition which was current in 1991. One hopes that Tullock has improved the book during the intervening decade.