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London : Luzac & co., 1939 [that is, 1940]
Harlew, Ethan, 1925-
[Place of publication not identified] : [publisher not identified], [1969]
The Oxford Dictionary of Quotations, 2014
May, Timothy
Encyclopedia of Leadership, 2004, Vol.2, p.566-570
Bilik, Naran
China (National University of Singapore. East Asian Institute), 2013-08, Vol.11 (2), p.25-41