According to a rough, unwritten law, the punishment of thieves they took into their own hands, and enforced confession and restitution.
"The Unknown Sea"
Clemence Housman
In endeavouring, however, for a moment to glance back into the unwritten past, and to reconstruct the conditions of some fourteen or fifteen centuries since, it must not be forgotten that the downs may then have presented a different appearance.
"Wild Life in a Southern County"
Richard Jefferies
Many American nations preserve a memory of historical events by unwritten traditions, repeated from fathers to sons; or communicated orally by the priests, chiefs or elderly men.
"The American Nations, Vol. I."
C. S. Rafinesque