Even though these various schools of thought can be identified, it is necessary to realize that some textual scholars might partially adopt the approaches of two or more schools, so that a synthesis often results. Likewise, schools tend to fluctuate over time due to the influx of new leaders and materials.
THE DOCUMENTARY APPROACH in New Testament Textual Studies
Scroll down if you are only interested in the book recommendations at the end of this article. However, it is better to have read the article, and it will offer you the one sure, objective, trusted approach at getting at the original words of the original texts.