For April 2018, Oxford Constitutions of the World (OCW) adds four new constitutional documents covering two countries.
|Constitution of the German Reich: August 11, 1919||Germany|
|Constitution of the Republic of Sierra Leone: September 24, 1991 (as Amended to June 8, 2016)||Sierra Leone|
|The Republic of Sierra Leone: Introductory Note||Sierra Leone|
|The Republic of Sierra Leone: Select Bibliography||Sierra Leone|