APA
League of Nations. Economic and Financial Section, International Economic Conference (1st : 1927 : Geneva) & League of Nations. Economic and Financial Section. (1927). Memorandum on coal. : .
Chicago
League of Nations. Economic and Financial Section, International Economic Conference (1st : 1927 : Geneva) and League of Nations. Economic and Financial Section. 1927. Memorandum on coal. : .
Harvard
League of Nations. Economic and Financial Section, International Economic Conference (1st : 1927 : Geneva) and League of Nations. Economic and Financial Section. (1927). Memorandum on coal. : .
MLA
League of Nations. Economic and Financial Section, International Economic Conference (1st : 1927 : Geneva) and League of Nations. Economic and Financial Section. Memorandum on coal. : . 1927.
