Jack Poirier calls attention to four books on a topic that few readers of the New Testament understand.
Studying the Gospels Synoptically

A synopsis allows us to see the differences in each Gospel—which is often valuable in understanding the texts and determining the better readings.
The Writings of Robert L. Lindsey

Despite Dr. Robert L. Lindsey’s workload as the full-time pastor of a Baptist congregation in Jerusalem, Israel, Lindsey wrote eleven books and booklets (including his monumental, three-volume A Comparative Greek Concordance of the Synoptic Gospels) and thirty-one articles.