4 bind i 6. - B.1. : Socialist thought : The forerunners 1789-1850. - B.2. : Socialist thought : Marxism and anarchism 1850-1890. - B.3 I-II. : The second international 1889 -1914. - B.4 I-II. : communism and social democracy 1914-1931. - Har bibliografi og register
