The supplements to this source endeavor to correct any functional or structural defects and upgrade the information making it more useful to the researcher. Holler, Frederick L., Information Sources of Political Science . A comprehensive five volume guide to the literature of political science and international affairs. Contains well written abstracts and has an easy to use arrangement. This is an 18 volume loose leaf collection of the constitutions of the countries of the world.
Arrangement is alphabetical by country.
More textual and less statistical in nature than yearbooks, this reference source offers an annual survey of economic conditions and trends for the countries of the world. Included in this source is a section on international organizations. The Europa World Yearbook . This is an annual data compilation providing geographical, economic, social and political data on countries and international organizations. Political Handbook of the World .