Wallace, W. K. (1922). The trend of history : origins of twentieth century problems / by W.K. Wallace: Origins of twentieth century problems. Macmillan.
Chicago Style (17th ed.) CitationWallace, W. K. The Trend of History : Origins of Twentieth Century Problems / by W.K. Wallace: Origins of Twentieth Century Problems. Macmillan, 1922.
MLA (9th ed.) CitationWallace, W. K. The Trend of History : Origins of Twentieth Century Problems / by W.K. Wallace: Origins of Twentieth Century Problems. Macmillan, 1922.
Warning: These citations may not always be 100% accurate.