A statistical and historical annual of the states of the world, Berks has volumes from 1960 - to date, with the latest one kept in Reference. Delury, George E., ed. Discusses the system of government and the parties of each country of the world. The Europa World Year Book. Ref JN1.E8501 Contains recent history, economic, political, statistical, and other information about countries and international organizations.
Berks has the latest edition.
Kurian, George Thomas, ed. World Encyclopedia of Parliaments and Legislatures . Contains extensive information on the legislative bodies of each country of the world, plus essays on issues affecting world parliaments. Sponsored by Research Committee of Legislative Specialists, International Political Science Association, and Commonwealth Parliamentary Association. Derbyshire, J. Denis, and Ian Derbyshire.