Oral gospel traditions called the M source for Matthew and the L source for Luke, which may have been a mix of written and oral material (see Two-source hypothesis). Most scholars believe that the author of John's gospel used oral and written sources different from those available to the Synoptic authors – a "signs" source, a "revelatory discourse" source, and others – although there are indications that a later editor of this gospel may have used Mark and Luke. Oral transmission may also be seen as a different approach to understanding the Synoptic Gospels in New Testament scholarship. Current theories attempt to link
New Testament text-type" and thought to have included witnesses such as Codex Koridethi and minuscule 565, can today be described neither as "Caesarean" nor as a text-type as was previously thought. However, the Gospel of Mark in Papyrus 45, Codex Washingtonianus and in Family 13 does indeed reflect a distinct type of text. Increasing standardization of distinct (and once local) text-types eventually gave rise to the Byzantine text-type. Since most manuscripts of the New Testament do not derive from the first several centuries, that is, they were copied after the rise of the Byzantine text-type, this form of text is found the