O'Brien, M. D. Socialism tested by facts. Liberty def. Leag (London).
Chicago Style (17th ed.) CitationO'Brien, M. D. Socialism Tested by Facts. Liberty def. Leag (London).
MLA (8th ed.) CitationO'Brien, M. D. Socialism Tested by Facts. Liberty def. Leag (London).
Warning: These citations may not always be 100% accurate.