Schnelle, Udo. The History and Theology of the New Testament Writings (en anglès). Minneapolis: Fortress Press, 1998, p.163. ISBN 9780800629526. «A comprehensive basis for the original-gospel hypothesis was provided in 1804 by Johann Gottfried Eichhorn (1752-1827), who argued for an Aramaic original gospel that each of the Synoptic evangelists had in a different form.»