Oon of Foure : the Wycliffite translation of Clement of Llanthony's Latin gospel harmony Unum ex quattuor.
Smith, P. M.,editor.
"1985 University of Southampton doctoral thesis : An edition of Parts I-V of the Wycliffite transaltion of Clement of Llanthony's Latin gospel harmony Unum ex Quattuor ; known as Oon of Foure" -- title page verso.