Steffen, World War and Imperialism.... Source references.
Henger, French Capital Investments, etc.
Kautsky, 1914 and 1915 (on imperialism, war, and Social-Democracy): 12. Die Neue Zeit, 1897–98. N.B.
B. Ischchanian, Foreign Elements in the Russian National Economy.
Pannekoek, “State Expenditure and Imperialism”
N.B. Die Neue Zeit XXVI—I—on immigration.